Yeah there can be messianic Jews I guess i what I was referring to, however Christans, while not being Orthodox jewish, do believe the Old Testament is the inspired Word of God.
Matthew 5 NKJV
The Beatitudes
5 And seeing the multitudes, He went up on a mountain, and when He was seated His disciples came to Him. 2 Then He opened His mouth and taught them, saying:
3 “Blessed are the poor in spirit,
For theirs is the kingdom of heaven.
4 Blessed are those who mourn,
For they shall be comforted.
5 Blessed are the meek,
For they shall inherit the [a]earth.
6 Blessed are those who hunger and thirst for righteousness,
For they shall be filled.
7 Blessed are the merciful,
For they shall obtain mercy.
8 Blessed are the pure in heart,
For they shall see God.
9 Blessed are the peacemakers,
For they shall be called sons of God.
10 Blessed are those who are persecuted for righteousness’ sake,
For theirs is the kingdom of heaven.
11 Blessed are you when they revile and persecute you, and say all kinds of evil against you falsely for My sake. 12 Rejoice and be exceedingly glad, for great is your reward in heaven, for so they persecuted the prophets who were before you.
Believers Are Salt and Light
13 “You are the salt of the earth; but if the salt loses its flavor, how shall it be seasoned? It is then good for nothing but to be thrown out and trampled underfoot by men.
14 “You are the light of the world. A city that is set on a hill cannot be hidden. 15 Nor do they light a lamp and put it under a basket, but on a lampstand, and it gives light to all who are in the house. 16 Let your light so shine before men, that they may see your good works and glorify your Father in heaven.
Christ Fulfills the Law
17 “Do not think that I came to destroy the Law or the Prophets. I did not come to destroy but to fulfill. 18 For assuredly, I say to you, till heaven and earth pass away, one [b]jot or one [c]tittle will by no means pass from the law till all is fulfilled. 19 Whoever therefore breaks one of the least of these commandments, and teaches men so, shall be called least in the kingdom of heaven; but whoever does and teaches them, he shall be called great in the kingdom of heaven. 20 For I say to you, that unless your righteousness exceeds the righteousness of the scribes and Pharisees, you will by no means enter the kingdom of heaven.
Murder Begins in the Heart
21 “You have heard that it was said to those [d]of old, ‘You shall not murder, and whoever murders will be in danger of the judgment.’ 22 But I say to you that whoever is angry with his brother [e]without a cause shall be in danger of the judgment. And whoever says to his brother, ‘Raca!’[f] shall be in danger of the council. But whoever says, [g]‘You fool!’ shall be in danger of [h]hell fire. 23 Therefore if you bring your gift to the altar, and there remember that your brother has something against you, 24 leave your gift there before the altar, and go your way. First be reconciled to your brother, and then come and offer your gift. 25 Agree with your adversary quickly, while you are on the way with him, lest your adversary deliver you to the judge, the judge hand you over to the officer, and you be thrown into prison. 26 Assuredly, I say to you, you will by no means get out of there till you have paid the last penny.
Adultery in the Heart
27 “You have heard that it was said [i]to those of old, ‘You shall not commit adultery.’ 28 But I say to you that whoever looks at a woman to lust for her has already committed adultery with her in his heart. 29 If your right eye causes you to [j]sin, pluck it out and cast it from you; for it is more profitable for you that one of your members perish, than for your whole body to be cast into hell. 30 And if your right hand causes you to [k]sin, cut it off and cast it from you; for it is more profitable for you that one of your members perish, than for your whole body to be cast into hell.
Marriage Is Sacred and Binding
31 “Furthermore it has been said, ‘Whoever divorces his wife, let him give her a certificate of divorce.’ 32 But I say to you that whoever divorces his wife for any reason except [l]sexual immorality causes her to commit adultery; and whoever marries a woman who is divorced commits adultery.
Jesus Forbids Oaths
33 “Again you have heard that it was said to those of [m]old, ‘You shall not swear falsely, but shall perform your oaths to the Lord.’ 34 But I say to you, do not swear at all: neither by heaven, for it is God’s throne; 35 nor by the earth, for it is His footstool; nor by Jerusalem, for it is the city of the great King. 36 Nor shall you swear by your head, because you cannot make one hair white or black. 37 But let [n]your ‘Yes’ be ‘Yes,’ and your ‘No,’ ‘No.’ For whatever is more than these is from the evil one.
Go the Second Mile
38 “You have heard that it was said, ‘An eye for an eye and a tooth for a tooth.’ 39 But I tell you not to resist an evil person. But whoever slaps you on your right cheek, turn the other to him also. 40 If anyone wants to sue you and take away your tunic, let him have your cloak also. 41 And whoever compels you to go one mile, go with him two. 42 Give to him who asks you, and from him who wants to borrow from you do not turn away.
Love Your Enemies
43 “You have heard that it was said, ‘You shall love your neighbor and hate your enemy.’ 44 [o]But I say to you, love your enemies, bless those who curse you, do good to those who hate you, and pray for those who spitefully use you and persecute you, 45 that you may be sons of your Father in heaven; for He makes His sun rise on the evil and on the good, and sends rain on the just and on the unjust. 46 For if you love those who love you, what reward have you? Do not even the tax collectors do the same? 47 And if you greet your [p]brethren only, what do you do more than others? Do not even the [q]tax collectors do so? 48 Therefore you shall be perfect, just as your Father in heaven is perfect.
NO they were jewish becuase they believed Jesus was God's messiah, fulfilling Old Testament prophecy. There are a spectrum of beliefs at any point in time, but that is the theme, Christ fulfilled all the prophetic Scripture which described the Son of God, the Messiah, the Savior.
Isaiah 9 NKJV
The Government of the Promised Son
9 Nevertheless the gloom will not be upon her who is distressed,
As when at first He lightly esteemed
The land of Zebulun and the land of Naphtali,
And afterward more heavily oppressed her,
By the way of the sea, beyond the Jordan,
In Galilee of the Gentiles.
2 The people who walked in darkness
Have seen a great light;
Those who dwelt in the land of the shadow of death,
Upon them a light has shined.
3 You have multiplied the nation
And [a]increased its joy;
They rejoice before You
According to the joy of harvest,
As men rejoice when they divide the spoil.
4 For You have broken the yoke of his burden
And the staff of his shoulder,
The rod of his oppressor,
As in the day of Midian.
5 For every warrior’s [b]sandal from the noisy battle,
And garments rolled in blood,
Will be used for burning and fuel [c]of fire.
6 For unto us a Child is born,
Unto us a Son is given;
And the government will be upon His shoulder.
And His name will be called
Wonderful, Counselor, Mighty God,
Everlasting Father, Prince of Peace.
7 Of the increase of His government and peace
There will be no end,
Upon the throne of David and over His kingdom,
To order it and establish it with judgment and justice
From that time forward, even forever.
The zeal of the Lord of hosts will perform this.
The Punishment of Samaria
8 The Lord sent a word against Jacob,
And it has fallen on Israel.
9 All the people will know—
Ephraim and the inhabitant of Samaria—
Who say in pride and arrogance of heart:
10 “The bricks have fallen down,
But we will rebuild with hewn stones;
The sycamores are cut down,
But we will replace them with cedars.”
11 Therefore the Lord shall set up
The adversaries of Rezin against him,
And spur his enemies on,
12 The Syrians before and the Philistines behind;
And they shall devour Israel with an open mouth.
For all this His anger is not turned away,
But His hand is [d]stretched out still.
13 For the people do not turn to Him who strikes them,
Nor do they seek the Lord of hosts.
14 Therefore the Lord will cut off head and tail from Israel,
Palm branch and bulrush in one day.
15 The elder and honorable, he is the head;
The prophet who teaches lies, he is the tail.
16 For the leaders of this people cause them to err,
And those who are led by them are destroyed.
17 Therefore the Lord will have no joy in their young men,
Nor have mercy on their fatherless and widows;
For everyone is a hypocrite and an evildoer,
And every mouth speaks [e]folly.
For all this His anger is not turned away,
But His hand is stretched out still.
18 For wickedness burns as the fire;
It shall devour the briers and thorns,
And kindle in the thickets of the forest;
They shall mount up like rising smoke.
19 Through the wrath of the Lord of hosts
The land is burned up,
And the people shall be as fuel for the fire;
No man shall spare his brother.
20 And he shall [f]snatch on the right hand
And be hungry;
He shall devour on the left hand
And not be satisfied;
Every man shall eat the flesh of his own arm.
21 Manasseh shall devour Ephraim, and Ephraim Manasseh;
Together they shall be against Judah.
For all this His anger is not turned away,
But His hand is stretched out still.
Prophecy concerning John the Baptist where God is preparing the way for Jesus to teach the people.
Malachi 3 NKJV
The Coming Messenger
3 “Behold, I send My messenger,
And he will prepare the way before Me.
And the Lord, whom you seek,
Will suddenly come to His temple,
Even the Messenger of the covenant,
In whom you delight.
Behold, He is coming,”
Says the Lord of hosts.
2 “But who can endure the day of His coming?
And who can stand when He appears?
For He is like a refiner’s fire
And like launderers’ soap.
3 He will sit as a refiner and a purifier of silver;
He will purify the sons of Levi,
And [a]purge them as gold and silver,
That they may offer to the Lord
An offering in righteousness.
4 “Then the offering of Judah and Jerusalem
Will be [b]pleasant to the Lord,
As in the days of old,
As in former years.
5 And I will come near you for judgment;
I will be a swift witness
Against sorcerers,
Against adulterers,
Against perjurers,
Against those who exploit wage earners and widows and orphans,
And against those who turn away an alien—
Because they do not fear Me,”
Says the Lord of hosts.
6 “For I am the Lord, I do not change;
Therefore you are not consumed, O sons of Jacob.
7 Yet from the days of your fathers
You have gone away from My ordinances
And have not kept them.
Return to Me, and I will return to you,”
Says the Lord of hosts.
“But you said,
‘In what way shall we return?’
Do Not Rob God
8 “Will a man rob God?
Yet you have robbed Me!
But you say,
‘In what way have we robbed You?’
In tithes and offerings.
9 You are cursed with a curse,
For you have robbed Me,
Even this whole nation.
10 Bring all the tithes into the storehouse,
That there may be food in My house,
And try Me now in this,”
Says the Lord of hosts,
“If I will not open for you the windows of heaven
And pour out for you such blessing
That there will not be room enough to receive it.
11 “And I will rebuke the devourer for your sakes,
So that he will not destroy the fruit of your ground,
Nor shall the vine fail to bear fruit for you in the field,”
Says the Lord of hosts;
12 “And all nations will call you blessed,
For you will be a delightful land,”
Says the Lord of hosts.
The People Complain Harshly
13 “Your words have been [c]harsh against Me,”
Says the Lord,
“Yet you say,
‘What have we spoken against You?’
14 You have said,
‘It is useless to serve God;
What profit is it that we have kept His ordinance,
And that we have walked as mourners
Before the Lord of hosts?
15 So now we call the proud blessed,
For those who do wickedness are [d]raised up;
They even tempt God and go free.’ ”
A Book of Remembrance
16 Then those who feared the Lord spoke to one another,
And the Lord listened and heard them;
So a book of remembrance was written before Him
For those who fear the Lord
And who [e]meditate on His name.
17 “They shall be Mine,” says the Lord of hosts,
“On the day that I make them My jewels.[f]
And I will spare them
As a man spares his own son who serves him.”
18 Then you shall again discern
Between the righteous and the wicked,
Between one who serves God
And one who does not serve Him.
Isaiah 40 NKJV
God’s People Are Comforted
40 “Comfort, yes, comfort My people!”
Says your God.
2 “Speak [a]comfort to Jerusalem, and cry out to her,
That her warfare is ended,
That her iniquity is pardoned;
For she has received from the Lord’s hand
Double for all her sins.”
3 The voice of one crying in the wilderness:
“Prepare the way of the Lord;
Make straight [b]in the desert
A highway for our God.
4 Every valley shall be exalted
And every mountain and hill brought low;
The crooked places shall be made [c]straight
And the rough places smooth;
5 The glory of the Lord shall be revealed,
And all flesh shall see it together;
For the mouth of the Lord has spoken.”
6 The voice said, “Cry out!”
And [d]he said, “What shall I cry?”
“All flesh is grass,
And all its loveliness is like the flower of the field.
7 The grass withers, the flower fades,
Because the breath of the Lord blows upon it;
Surely the people are grass.
8 The grass withers, the flower fades,
But the word of our God stands forever.”
9 O Zion,
You who bring good tidings,
Get up into the high mountain;
O Jerusalem,
You who bring good tidings,
Lift up your voice with strength,
Lift it up, be not afraid;
Say to the cities of Judah, “Behold your God!”
10 Behold, the Lord God shall come [e]with a strong hand,
And His arm shall rule for Him;
Behold, His reward is with Him,
And His [f]work before Him.
11 He will feed His flock like a shepherd;
He will gather the lambs with His arm,
And carry them in His bosom,
And gently lead those who are with young.
12 Who has measured the [g]waters in the hollow of His hand,
Measured heaven with a [h]span
And calculated the dust of the earth in a measure?
Weighed the mountains in scales
And the hills in a balance?
13 Who has directed the Spirit of the Lord,
Or as His counselor has taught Him?
14 With whom did He take counsel, and who instructed Him,
And taught Him in the path of justice?
Who taught Him knowledge,
And showed Him the way of understanding?
15 Behold, the nations are as a drop in a bucket,
And are counted as the small dust on the scales;
Look, He lifts up the isles as a very little thing.
16 And Lebanon is not sufficient to burn,
Nor its beasts sufficient for a burnt offering.
17 All nations before Him are as nothing,
And they are counted by Him less than nothing and worthless.
18 To whom then will you liken God?
Or what likeness will you compare to Him?
19 The workman molds an image,
The goldsmith overspreads it with gold,
And the silversmith casts silver chains.
20 Whoever is too impoverished for such [i]a contribution
Chooses a tree that will not rot;
He seeks for himself a skillful workman
To prepare a carved image that will not totter.
21 Have you not known?
Have you not heard?
Has it not been told you from the beginning?
Have you not understood from the foundations of the earth?
22 It is He who sits above the circle of the earth,
And its inhabitants are like grasshoppers,
Who stretches out the heavens like a curtain,
And spreads them out like a tent to dwell in.
23 He [j]brings the princes to nothing;
He makes the judges of the earth useless.
24 Scarcely shall they be planted,
Scarcely shall they be sown,
Scarcely shall their stock take root in the earth,
When He will also blow on them,
And they will wither,
And the whirlwind will take them away like stubble.
25 “To whom then will you liken Me,
Or to whom shall I be equal?” says the Holy One.
26 Lift up your eyes on high,
And see who has created these things,
Who brings out their host by number;
He calls them all by name,
By the greatness of His might
And the strength of His power;
Not one is missing.
27 Why do you say, O Jacob,
And speak, O Israel:
“My way is hidden from the Lord,
And my just claim is passed over by my God”?
28 Have you not known?
Have you not heard?
The everlasting God, the Lord,
The Creator of the ends of the earth,
Neither faints nor is weary.
His understanding is unsearchable.
29 He gives power to the weak,
And to those who have no might He increases strength.
30 Even the youths shall faint and be weary,
And the young men shall utterly fall,
31 But those who wait on the Lord
Shall renew their strength;
They shall mount up with wings like eagles,
They shall run and not be weary,
They shall walk and not faint.