If that's an open question to non-muslims as well, I don't think you can be "born" into any faith. You can only be born to parents who have certain beliefs, and within a culture where particular beliefs are dominant.
Whatever rituals there may be, circumcision, baptisement or whatever, its meaningless until you are old enough to think about it and make up your own mind. The only thing that changes over time is the information and influences you have, obviously early on the influence of parents, education and prevailing culture will be so overpowering you are only likely to choose one way. As you get older though, and your world broadens up a little, you may learn other things or meet other people that result in you embracing a new faith. Or rejecting religion altogether, come to that.