I'm not saying that you can't be religious and attend/work at a public school. Studying religions in a social/religious studies type of class is fine, in my opinion. Teachers should not (and as far as I'm aware, are not allowed to) use their positions of power to proselytize for their beliefs/churches/whatever to their students. So let's just keep it where it needs to stay, okay?
On the topic of creationism being taught in public schools: No. It doesn't belong. If you can't give valid scientific evidence that doesn't rely on the bible, then it has no place in public schools. Teach it all you want in private schools, but as I said above, keep religion OUT of PUBLIC schools, specifically in Science classes.