Are there any married couples where one is Catholic and the other is Christian?

@Soossie Catholics are Christians.

@WildWings

I know, right??

@Soossie yes. Catholics and Protestants are Christians but Wendy Lopez who wrote the question is unaware of that.

@WildWings @Soossie Catholics and born again Christians for instance have differences in belief and practices (ex: about sculpted idols). I think that's what the poster meant. I can see why a couple made from these two may face issues.