Wedding With Clashing Religions --- Help!!!!

My fiance and I have nearly everything planned for our wedding, however, there is one rather large glitch! His family is Lutheran, mine is Catholic. On top of that, he is agnostic and I am Pagan. I need help finding even ground so as not to step on my own beliefs while not stepping on anyone else`s emotions. Sticky situation that needs to be avoided! Please help! Thanks, Laura