I agree with you that Adam was "the inlet" for all whom he represented...all of humanity.
He let sin into the world.
We agree on that.
But to show that your point is correct that all men sinned when Adam sinned,,,you would have to support the two following
ideas:
1. Please show where in scripture it states that we are RESPONSIBLE for other men's sins.
2. Please show where in Romans 5:12 it states that we each sinned when Adam did.
I've already exegeted Romans 5:12 for you...could you do the same?
Romans 5:12
12Therefore, just as through one man sin entered into the world, and death through sin, and so death spread to all men, because all sinned—
In the very next verse it says that sin was NOT IMPUTED until the Law...
This is what I, and others, have been stating to you.....
Adam's sin is NOT IMPUTED to us...
we are not RESPONSIBLE for HIS sin...only for ours.
Death comes to us because we sin individually.
13for until the Law sin was in the world, but sin is not imputed when there is no law.