[cloudmountain]

Im glad you agree that the immaculate birth wasn't necessary. The theological mathematics that deem it necessary are presumptuous and silly.
1. What evidence is there that God chose to make Mary sinless?
2. What would chairs look like if our knees bent the other way?

1. Heck if I know. You'd have to ask the scholars on this site. What I learned (beyond Catholic grammar and high school) I learned from homilies, adult cathechism classes, Catholic Answers, EWTN discussions and presentations, etc. THEY quoted chapter and verse but I did NOT take notes. I DO remember that the angel Gabriel addressed Mary, as Mary, full of grace. If she were not full, I ponder, then perhaps there would be sin to fill in the lack of fullness. But, since she was full...dot, dot, dot.

2. We'd be "sitting" on our bellies. It WOULDN'T be pretty.

[Tramonto]

I DO remember that the angel Gabriel addressed Mary, as Mary, full of grace. If she were not full, I ponder, then perhaps there would be sin to fill in the lack of fullness. But, since she was full...dot, dot, dot.

Doesn't grace mean "unearned favor"? If Mary was full of grace ("unearned favor" or "a favor or blessings bestowed as a gift") does that mean she was sinless? It doesn't seem like a logical conclusion to me.