Yeah, some of them are. That's why I usually appease them when it isn't too difficult/painful for me (for example, I go to church on Christmas Eve, say the blessing before dinner, etc). However, I refuse to have my wedding ceremony be a church service or to vow things I don't believe. We're pretty much writing our ceremony from scratch.
That said, if they don't pay attention too closely to the ceremony they probably won't notice. We're getting married in the historical chapel on the campus of Jason's alma mater, and we're following the traditional order of Protestant wedding ceremonies. Also, I'll be carrying a small Bible down the aisle (underneath my flowers) that my grandmother and mother carried in their weddings. My grandmother told me I didn't have to, but that it would "break her heart" if I didn't....