[pgyanke]

In fact, IF Mary was sinless, why didn't SHE die for our sins instead of Jesus? There's a serious question for you.

That's a poorly conceived challenge. It shows the weakness of your own understanding. The simple answer is that she isn't God.

[redleghunter]

You are right a better question is Mary’s mother and her father’s seed would need to be sinless as well and their parents etc.

Mary was conceived of a human man and woman right?