>>1 of course it's possible! Religion is an extremely personal system of beliefs when you really get down to it. Granted it can seem a religion has to be a cookie-cutter set of beliefs but it doesn't have to be. In fact I think that if you get a little creative with it, mix a few things together and come up with your own (healthy and non-harmful) set of beliefs, it's even better.
So even if on paper your beliefs may oppose each other, personally they must not oppose each other based of the fact that you believe in both at the same time.
I hope that this helps~!