Relationship advice???

Should religion be a problem in a relationship? Should it be a cause of break up? Even though both persons love each other?. I been with my boyfriend for 3 months and we had the talk about marriage because I said my ideal wedding would be in a catholic church and he would like something small and simple. We managed to work stuff out bit now it seems like religion is getting between us. He kinda wanted to just break up since he knows later in life it can be an issue, I tried to work things out with him tried to explain that we shouldnt let that get in between us and also when 2 people love each other their love should be stronger. Now I know I like him alot and as far as I know if we get to that step I would like to him my husband but he keeps thinking negative about us now idk how to tell him to make it work. Idk if I'm wrong? Could it be problem? I know people that are from different religions and they still stay together and have a family so my point here is I want to prove to him that it shouldnt get in between us because I know I want him. Any advice please? 1 minute wont take alot of your time. Thanks ladies.