Is there a false New Covenant? How do we know which one is real?

We've been warned beforehand of the false Christ's and prophets that would come.
Mat 24:24 For there shall arise false Christs, and false prophets, and shall shew great signs and wonders; insomuch that, if it were possible, they shall deceive the very elect.
Mat 24:25 BEHOLD, I HAVE TOLD YOU BEFORE.
The deception is so great that if it were possible even the Elect would be deceived. There's a specific reason why His chosen ones cannot be deceived but before going into it we should read what Peter wrote concerning election.
2Pe 1:10 Wherefore the rather, brethren, give diligence to make your calling and election sure: for if ye do these things, ye shall never fall:
Knowing that it is our duty to give all diligence to make our calling and election sure, it's important to understand that this Election is directly tied to our willingness to Hear and Receive the Gospel that Yahshua taught.
Joh 17:8 For I have given unto them the words which thou gavest me; AND THEY HAVE RECEIVED THEM, and have known surely that I came out from thee, and they have believed that thou didst send me.
Joh 17:9 I pray for them: I pray not for the world, but for them WHICH THOU HAST GIVEN ME; for they are thine.
Joh 17:10 And all mine are thine, and thine are mine; and I am glorified in them.
Joh 17:11 And now I am no more in the world, but these are in the world, and I come to thee. Holy Father, keep through thine own name those whom thou hast given me, that they may be one, as we,
According the the Mediator of the New Covenant, it is those that have received His words that are being preserved and it is through Yahweh's Name that He preserves them. Being armed with the knowledge that we must cleave to His Testimony in order to be protected from falsehood is of extreme importance.
"Christianity" preaches a Christ that has been separated from the very same Truth that He came to declare, not realizing that It is His very Words that are the terms for the New Covenant, as the New Covenant was confirmed in Him.
Gal 3:17 And this I say, that the covenant, that was confirmed before of Elohim IN CHRIST, the law, which was four hundred and thirty years after, cannot disannul, that it should make the promise of none effect.
We know that the New Covenant was confirmed in Christ but what does the Father say that the New Covenant is?
Jer 31:31 Behold, the days come, saith Yahweh, that I will make a new covenant with the house of Israel, and with the house of Judah:
Jer 31:32 Not according to the covenant that I made with their fathers in the day that I took them by the hand to bring them out of the land of Egypt; which my covenant they brake, although I was an husband unto them, saith Yahweh:
Jer 31:33 But this shall be the covenant that I will make with the house of Israel; After those days, saith Yahweh, I will put MY LAW IN THEIR INWARD PARTS, AND WRITE IT IN THEIR HEARTS; and will be their Elohim, and they shall be my people.
Thus saith Yahweh! This should mean everything to those seeking after Truth. The Old Covenant was with Israel and so is the New Covenant. This is important, in and of itself, as it is not with a Gentile Church. Yahweh also say's that the Covenant is Him placing His Law in His peoples Hearts. This is the new Birth as described in Ezekiel.
Eze 36:25 Then will I sprinkle clean water upon you, and ye shall be clean: from all your filthiness, and from all your idols, will I cleanse you.
Eze 36:26 A NEW HEART ALSO WILL I GIVE YOU, AND A NEW SPIRIT WILL I PUT WITHIN YOU, and I will take away the stony heart out of your flesh, and I will give you an heart of flesh.
Eze 36:27 And I will put my spirit within you, AND CAUSE YOU TO WALK IN MY STATUTES, and ye shall keep my judgments, AND DO THEM.
Note that the Holy Spirit (Set Apart Spirit) will cause us to walk in obedience to His commandments just as the Mediator of the that New Covenant commanded.

The Father set His son as the Mediator in much the same way that He set Moses as the Mediator of the first covenant.
Deu 18:18 I will raise them up a Prophet from among their brethren, like unto thee, and will put my words in his mouth; and he shall speak unto them all that I shall command him.
Deu 18:19 And it shall come to pass, that whosoever will not hearken unto my words which he shall speak in my name, I will require it of him.
The mediator communicates the terms of the covenant. We see that clearly in the Old Covenant with Moses. Moses mediated that covenant by standing between Yahweh and the people and gave the people the terms for that covenant. He showed the people the Word of Yahweh.
Deu 5:5 (I (Moses) stood between Yahweh and you at that time, to shew you the word of Yahweh for ye were afraid by reason of the fire, and went not up into the mount;) saying...
That very same Word of Yahweh was made flesh and declared the Gospel openly. His record is true and it is recorded for us in scripture. We also see the Father reiterate in Mathew who it is that we have to Hear for this New Covenant.
Mat 17:5 While he yet spake, behold, a bright cloud overshadowed them: and behold a voice out of the cloud, which said, This is my beloved Son, in whom I am well pleased; HEAR YE HIM.
An important fact to keep in mind is that in many English translations the Greek word diathēkē is sometimes translated Testament. I bring this up because it does add confusion and I feel the need to clarify that it is the very same word that should have been translated "Covenant". There are many subtle devices that have been used in order to veil the Truth. One such example is that of the piece of paper that is inserted in every Bible between the book of Malachi and the Book of Mathew that says "NEW TESTAMENT", as if the Word of Yahweh before that page needs to somehow be divided from the rest of His Word. On the page just before that man made divider Yahweh say's this.
Mal 4:4 Remember ye the Law of Moses, WHICH I COMMANDED UNTO HIM in Horeb for all Israel, with the statutes and judgments.
The Father commanded Moses what to say in showing him His ways.
Exo 33:13 Now therefore, I pray thee, if I (Moses) have found grace in thy sight, shew me now thy way, THAT I MAY KNOW YOU, that I may find grace in thy sight: and consider that this nation is thy people.
We know Him through is Law. We cannot separate the Fathers character from His code of conduct anymore than we can separate any persons character from theirs.
Psa 25:4 Shew me thy ways, O Yahweh teach me thy paths.
Psa 25:5 Lead me in thy truth, and teach me: for thou art the Elohim of my salvation; on thee do I wait all the day.
His Truth and His ways are His Law which He gave thru Moses the mediator of the Old Covenant and reiterated thru His Son, the Mediator of the New Covenant. His Spirit will lead us to walk in His Ways. This is the New Covenant that He made with the House of Judah and the House of Israel.
This Covenant was confirmed with Messiahs Blood.
Mat 26:27 And he took the cup, and gave thanks, and gave it to them, saying, Drink ye all of it;
Mat 26:28 For this is my blood of the new covenant, which is shed for many for the remission of sins.
He sacrificed Himself in order to establish this Covenant and it is Him that we have to Hear and Obey. In doing so we will know both the Father and the Son.
Joh 17:3 AND THIS IS LIFE ETERNAL, that they might know thee the only true Elohim and Yahshua the Messiah, whom thou hast sent.