Yup. Show where God in the N.T. spoke to non-proselyte Gentiles, totally apart from Israel, and made any covenant with them, and you win.
Stipulation: the verse you cite must be in the context of non-proselyte Gentiles, and must use the word "covenant." Chapter and verse on that, please.
Heb 12:22 But ye are come unto mount Sion, and unto the city of the living God, the heavenly Jerusalem, and to an innumerable company of angels,
Heb 12:23 To the general assembly and church of the firstborn, which are written in heaven, and to God the Judge of all, and to the spirits of just men made perfect,
Heb 12:24 And to Jesus the mediator of the new covenant, and to the blood of sprinkling, that speaketh better things than that of Abel.
Heb 12:25 See that ye refuse not him that speaketh. For if they escaped not who refused him that spake on earth, much more shall not we escape, if we turn away from him that speaketh from heaven:
Heb 12:26 Whose voice then shook the earth: but now he hath promised, saying, Yet once more I shake not the earth only, but also heaven.
Heb 12:27 And this word, Yet once more, signifieth the removing of those things that are shaken, as of things that are made, that those things which cannot be shaken may remain.
Heb 12:28 Wherefore we receiving a kingdom which cannot be moved, let us have grace, whereby we may serve God acceptably with reverence and godly fear:
Heb 12:29 For our God is a consuming fire.
So you believe Christ is going to marry Himself?
No.
Christ will marry His bride which is His Body on earth.
Eph 5:23 For the husband is the head of the wife, even as Christ is the head of the church: and he is the saviour of the body.
Eph 5:24 Therefore as the church is subject unto Christ, so let the wives be to their own husbands in every thing.
Eph 5:25 Husbands, love your wives, even as Christ also loved the church, and gave himself for it;
Eph 5:26 That he might sanctify and cleanse it with the washing of water by the word,
Eph 5:27 That he might present it to himself a glorious church, not having spot, or wrinkle, or any such thing; but that it should be holy and without blemish.
Eph 5:28 So ought men to love their wives as their own bodies. He that loveth his wife loveth himself.
Eph 5:29 For no man ever yet hated his own flesh; but nourisheth and cherisheth it, even as the Lord the church:
Eph 5:30
For we are members of his body, of his flesh, and of his bones.
Eph 5:31 For this cause shall a man leave his father and mother, and shall be joined unto his wife, and they two shall be one flesh.
Eph 5:32 This is a great mystery: but I speak concerning Christ and the church.
LA