I'm a humanist, which is a term I first heard from Kurt Vonnegut in the 1990's. He explained humanism as treating people really well, like "Proper Christians," even if you don't believe in God.
I'm something similar, but the other direction. I have faith, believe knowingly, that other realities do exist, but since I possess no provable way of getting to a different reality, I behave how I want other people to behave, under the circumstances, in this one.
I try to do good because I know it is the right thing to do, regardless of where I am.