Wedding Help

Hey, so my fiancé and I come from two very different backgrounds but are literally each other’s best friend. My family is super religious, his is not. I can’t act myself with my SO around my family. It’s just awkward and I would probably be so disowned if I did. Anyway. If I don’t invite them to the reception afterwards (it’s at the same place) I’m going to get disowned then too. So I’m in a bind, not sure what to do. If anyone has any advice that would be great! Thanks!