[metmom]

There are four people in Scripture who were born immaculately (not under Original Sin)... Adam, Eve, Mary and Jesus. Adam and Eve should be obvious as they had not yet committed sin before they were formed. Christ should be obvious as He was the unblemished Lamb of God. He was also the new Adam (1 Cor 15:45). Mary was the new Eve. Here is a link to a good discussion what it all means and why it is necessary: http://www.stpeterslist.com/682/6-biblical-reasons-mary-is-the-new-eve/.

Adam and Eve were not born immaculately. They were created.

If it were necessary for Mary to be born without sin because of Jesus, then it would have been necessary for Mary's mother to be born without sin. If Mary could have been born without sin of a sinful mother by an act of God, then Jesus could also.

In order for Jesus to share fully in our humanity, being born and raised by sinful parents would be part and parcel of it.

[Cvengr]

If it were necessary for Mary to be born without sin because of Jesus, then it would have been necessary for Mary's mother to be born without sin.

There have been some doctrines which conclude the sin nature is passed genetically by the man, rather than the woman alone, hence the possibility of a virgin birth of Jesus Christ from Mary and the Holy Spirit being adequate for the second Adam. I don't know if they are fully sound, but I wanted to point out it might be sound doctrine without resorting to an infinite lineage of sinless mothers to birth the second Adam.

[verga]

If it were necessary for Mary to be born without sin because of Jesus, then it would have been necessary for Mary's mother to be born without sin.

God created the universe out of nothing. If the prot god is not powerful enough to create a sinless individual the prots need a more powerful God. Try the Christian/ Catholic God