Ask him if his God is the God of Isaac and Jacob and Abraham. When he says that "he" is, then remind him that your "God" is too. Yes, you worship in a different way. You have different days that are important to you than are important to him. When children come along, you will have to make some difficult decisions as to which denomination is their "official" denomination. But as Dalia mentioned, Jesus was a Jew and that doesn't prevent the Catholics from listening to what he had to say. If you truly love each other, you will be able to find a way to work this difference out. My husband and I are not of the same denomination, but we have found a common ground and our 8 year old daughter knows the tenants of both religions and knows what parts are the same and whats parts are different. She also knows that her father and I agree that the is one "supreme being" and that the way a person chooses to worship that supreme being is a personal matter of choice. No way is the "right way" or the "best way". They are just different ways. We all want the same thing, to get to the "top of the mountain". And some people like to do it via rock climbing, and some want to ride small donkeys, and some need to ride in a helicopter, and some want to walk the winding path, but when we all get to the top, the view is still the same. Peace to you.