I'm a polytheist with an active practice of that polytheism but I probably have more in common with the OP and many born again Christians than I would with someone who didn't believe in ANYTHING. We have in common that we believe in something, it's the contents of the belief that are different. Religious people of different faiths have more in common with each other than either has with totally non religious people.
Some religions play together better than others - on my "okay list" for dating are Unitarian Universalist (in fact my main attendance is at a UU church), Buddhist, pagan, a more liberal Christian, among other systems... but I've actually had worse experience with atheist/skeptic types than anyone else despite the fact that we both believe in science and evolution and have common political views. It falls apart at the actual belief level.