Why is it Adam's sin when Eve clearly initiated it? Even the punishment exacted by God for it seems to be harsher on the woman (painful birth) than man (toiling the field). And, wasn't it Paul who says
And it was not Adam who was deceived, but the woman being deceived, fell into transgression—1 Timothy 2:14 So, which scripture is metmom referring to?

Yes, Eve was deceived but that doesn't change that Scripture attributes to the man sin entering the world.

Read Genesis again.

God gave the command to Adam, THEN created Eve. It was Adam's responsibility to pass on that ONE verse correctly to Eve.

Then there's this, nice guy that Adam was....

Genesis 3:1-7 1Now the serpent was more crafty than any other beast of the field that the LORD God had made.

He said to the woman, "Did God actually say, 'You shall not eat of any tree in the garden'?" 2And the woman said to the serpent, "We may eat of the fruit of the trees in the garden, 3but God said, 'You shall not eat of the fruit of the tree that is in the midst of the garden, neither shall you touch it, lest you die.'" 4 But the serpent said to the woman, "You will not surely die. 5For God knows that when you eat of it your eyes will be opened, and you will be like God, knowing good and evil." 6So when the woman saw that the tree was good for food, and that it was a delight to the eyes, and that the tree was to be desired to make one wise, she took of its fruit and ate, and

she also gave some to her husband who was with her,

and he ate. 7 Then the eyes of both were opened, and they knew that they were naked. And they sewed fig leaves together and made themselves loincloths.

In verse one, Satan questions God's Word.

In verse two, Eve misquotes what God told Adam.

Adam was there with Eve watching this entire conversation. He did nothing to stop her. He watched her listen to Satan without correcting the error in her misquoting of the ONE verse they had to obey. He watched WHILE SHE ATE. Apparently, when he saw that nothing happened to her, he figured it was safe and ate as well.

It was after HE ate that the eyes of both of them were opened.

The responsibility was Adam's. God gave him dominion over the whole earth. He was responsible for his family. He failed. The sin was his for disobedience. He did not protect her and chose to disobey God when he had no excuse as he talked with God himself.