Is it normal I'm a Muslim atheist.

Meh, probably. I can't say your going to make a lot of friends though, lol. Muslims will think of you as a deserter of the faith, and with the way they're going about their massacres (depending on where you live, but lately it feels like I'm reading about them everywhere...), I'd hate to be on the wrong end of that. And, of course, everyone seems to hate Muslims now... so if you look the Muslim part and say you were born Muslim... again, not many friends. And as far as atheists go... everyone is going to be trying to convert you and when you refuse to comply... again, not too many friends... but more then if you were Muslim at this point in time... of course this is heavily dependent on where you live and what ethnicity you are.... good luck! Don't move to Egypt! :P