Can you believe in the existence of more than one higher power?

Ok, for years I have tried going to church. My parents raised my sister and I to pick for ourselves as long as it didn't involve something illegal or infringe on the beliefs of others. My sister became a christian and I have never been a church going person. What I believe is that if I am able to believe in the existence of God and Jesus, then surely there is a possibility that Buddha, Vishnu, Allah, Muhammad, even the gods and goddesses of the world exist too. Is there a term for someone who believe is the possibility that high powers deity exist without having to be confined to one religion?