M*slims would say everyone is born a pure, m*slim, which is why they call converting to ***** "reverting" to your original faith.

I think it's poppycock.  A baby is about as capable of understanding the concept of a deity as a dog is.  They don't gain that capacity of thought till much later, and if you are not capable of entertaining the thought, you can't be a believer.  Atheism also requires a particular belief, the belief that there is no higher being as such.  Again, beyond the capacity of a baby.

Original sin is one of the most annoying things to me about Christianity.  To me, it is like literally saying that no matter what you do, you can't really win.  I like that in the Orthodox Church, most people don't treat it with the same amount of guilt and doom as in western churches. 

Poor, guilt-ridden babies :D