1 Cor 15:22
For as in Adam all die, so also in Christ shall all be made alive.
Romans 5:12
Therefore, just as sin came into the world through one man, and death through sin, and so death spread to all men because all sinned
Put those two together and you will see. DEATH spread to all men through Adam.
I would encourage you to read the words as if they are true and makes sense.
In 1 Cor 15:22 the text says all men in the family of Adam die. It does not say what you make it say, which is, in Adam all are dead.
The verse just before this says the following;
21 For since by man came death, by man came also the resurrection of the dead.
Just for fun, if you were not reading these verses with a deep abiding bias, what would you think would be the death that is relative to this context? I already know what you are trying to prove, and that is that this passage is speaking of babies who are born into the family headed by Adam and not full grown adults who die eventually because in Adam they do not have eternal life and certainly no power in them to resist sin. In your next verses it will be laid out clearly that it is not being born that causes them to die, but being in Adam's image which all men receive by being born in his image.
Now, Jesus Christ was not born in the image of Adam, he was born in the image of his Father, God. He did have in him from birth the power to resist sin, and he never sinned. Though the body of our Lord Jesus was not mature enough to resist sin as he grew, the Spirit of God who dwelt in him was as mature the day he was born as the day he willingly died on the cross for all those born in Adam, all of whom eventually willingly bowed to the sovereign of this world, sin.
Being in the image of Adam just means that being in the image of God is distinguished by the fact that God indwells the body of those who are in his image while those in the image of Adam are absent the Spirit. It is not a sin to be this way, it is how they are born. Now, the body of Jesus and the soul of Jesus came through his natural birth but the Spirit of God came from the Father, God. This is what it means to be in the image of God, three in one and one in three. Jesus Christ is the only man who has ever been in the image of God to this point in time, his resurrection, except Adam before the fall. The difference between the two is that Adam did not exist before but was created this way and Jesus, was from everlasting, a Spirit (God is a Spirit Jn 6:63) and was physically born as both a man, being God. I am not guessing about this, it is what the scriptures teach. Now, all them who are born again into the family of God, with Jesus as the head of the family, are in the image of God. God is their Father and they are all "sons" of God, viewed by God the Father as completely righteous, because they are "in Christ" and he no longer sees us "in Adam."
Now, you are going to need to see some verses;
Joh 1:1 In the beginning was the Word, and the Word was with God, and the Word was God.
2 The same was in the beginning with God.
4 In him was life; and the life was the light of men.
Joh 3:31 He that cometh from above is above all: he that is of the earth is earthly, and speaketh of the earth: he that cometh from heaven is above all.
32 And what he hath seen and heard, that he testifieth; and no man receiveth his testimony.
33 He that hath received his testimony hath set to his seal that God is true.
34 For he whom God hath sent speaketh the words of God: for God giveth not the Spirit by measure unto him.
35 The Father loveth the Son, and hath given all things into his hand.
36 He that believeth on the Son hath everlasting life (when he believes): and he that believeth not the Son shall not see life; but the wrath of God abideth on him.
Ro 5:17 For if by one man’s offence (ADAM) death reigned by one; much more they which receive abundance of grace and of the gift of righteousness shall reign in life by one, Jesus Christ)
19 For as by one man’s disobedience many (not babies but them who sinned) were made sinners, so by the obedience of one shall many (who receive the Spirit) be made righteous.
20 Moreover the law entered, that the offence might abound. But where sin abounded, grace did much more abound:
The law made men more notable sinners.
Now here is the Sovereignty of sin in Adam's race;
Ro 5:21 That as sin hath reigned unto death, even so might grace reign through righteousness unto eternal life by Jesus Christ our Lord.
He proves this by the fact that all from Adam to Moses died without the law, and all from Moses until Christ came died with the law, but since Christ died and rose again, he imputes his own righteousness to them who will receive it and when they die they will be like him and rise from the dead. He calls this time frame "the grace of God." It is not just grace but "the abundance of grace." It is described thusly;
18 Therefore as by the offence of one judgment came upon all men (not babies) to condemnation; even so by the righteousness of one the free gift came upon all men unto justification of life.
19 For as by one man’s disobedience many were made sinners, so by the obedience of one shall many be made righteous.
There is much more wonderful truths in these passages. I pray you do not approach these plain words with a bias that will darken your mind but allow the words to mean what they say.