@stavvers What does a Christian baby look like I wonder? Tasty? I'd need to know how to spot one from all the other babies first.
Oh, yeah hang on, there's no such thing. You mean unicorns right? Because no baby ever born was born with religion. I'm afraid birth is a a-theist experience, and has nothing to do with religion. It can become a Chrsitian child, as being a baby then small child it will do what it takes to mimic it's family environment. It will learn its family language(s) and culture and oh, yes, religion.
But prior to that, of course it has no religion. And so, the question is hypthetical at some almost childish level.