Most churches and religions have a problem with marriage outside their religion.
True. I asked because this is at least one indicator (the best I could come with) of how a religion views non-members. If the answer is pretty much one of just a prefernce for members over non-members, then no biggie. If however, there is a strict prohibition because non-believers are viewed as unworthy or heathen (or whatever), then it's a different matter, at least for me.