Cathode from your posts it is obvious that you will not accept the Word of God as written. You even go so far as to tell me I do not know how to read or understand clear English. You do not want truth you need compliance. Your faith is not based on the written word but on what the RCC has told you.
By your own words you have placed you salvation in the hands of the RCC and their Marian dogma's
"If you convince me that Mary was a sinner, and Jesus was conceived of her sinful flesh, then it’s over.
I would abandon Christianity altogether.
See I would follow through to the end conclusion of your position. If Jesus was conceived of sinful flesh, then He would be a sinner, then all Christianity is false, and my Bible would go straight into the garbage."
So you do not need the bible just the RCC church to tell you what to believe. So you might as well throw out your bible as you do not believe it is the Word of God.
If you convinced me Jesus was conceived of sinful flesh, I wouldn’t be Catholic, Baptist or Protestant, all Christianity would be proven false at that point.
Jesus had to be the unblemished Lamb of God who takes away the sins of the world. His unblemished sinless flesh and blood was the only worthy sacrifice to save us from sin and death.