That which is born of the flesh is flesh; and that which is born of the Spirit is spirit. John 3:6
but the death did reign from Adam till Moses, even upon those not having sinned in the likeness of Adam's transgression, who is a type of him who is coming. Rom 5:14
but that which is spiritual is not first, but that which was natural, afterwards that which is spiritual. ! Cor 15:46
Now this I say, brethren, that flesh and blood cannot inherit the kingdom of God; neither doth corruption inherit incorruption. 1 Cor 15:50
Marvel not that I said unto thee, Ye must be born again. John 3:7
Hebrews 2:6 But one in a certain place testified, saying, What is man (Singular), that thou art mindful of him? or the son (?Son?) of man (Singular), that thou visitest him?
Jesus came like the first man Adam and in death was the last Adam of that type and by the resurrection from the dead the Second Adam as spiritual.
Consider
2 Cor 5:14-16 For the love of Christ constraineth us; because we thus judge, that if one died for all, then were all dead: And that he died for all, that they which live should not henceforth live unto themselves, but unto him which died for them, and rose again. Wherefore henceforth know we no man after the flesh: yea, though we have known Christ after the flesh, yet now henceforth know we him no more.
Col 1:18 YLT And himself is the head of the body -- the assembly -- who is beginning, first-born out of the dead, that he might become in all -- himself -- first,
Rom 8:29 YLT because whom He did foreknow, He also did fore-appoint, conformed to the image of His Son, that he might be first-born among many brethren;