Do you think it's possible to be friends with your ex again?

Or at least on terms where it's not awkward? I know it didn't end the best. Religious differences. He wanted me to be a total bible thumper. Yes of course I wanted the relationship to be serious,but to a point. I'm too young to be that serious about that stuff. I want to live life with no stress and worries like a normal teenager doing normal teenage things.

Anyways, now that you know what's the problem was. Back to my question, I want to be on good teems because one of my good friends is dating one of his good friends which makes things complicated for those two. He's also friends with all of my friends or either talks to them. Its just so awkward for my friends. I just don't want it to be awkward.