Most definitely. I say this because membership in religions are just one of the ways people form into groups. Groups, by definition, have members and non-members. Once people form into groups, the members start competing with other groups over limited resources or perceived limited resources. We see this over and over in nature with all social species. This is the way we evolved, and you shouldn't expect it to ever stop. Religion is really a side-track. If all religions in the world suddenly vanished, group competition would continue. We're naturally tribal and tribes naturally compete with other tribes. But, don't let this bring bad opinions to your mind, if you truly think about it, it is true. Your religious life, however, is yours to do with what you feel is right, so don't let this change that. ::-)