I have an incident.. it was my friend's wedding with a catholic.. and u know how they give you cookie and wine at the end of some ceremony (i think they call it communion or something)... everyone were given one but we were asked if we were catholics,, we said no and so we were not given the cookie.. but if you go to a temple anywhere (the only exception in the world is pashupatinath of nepal), they will be happy to give anyone prasadam and bhoj... and even let them participate in dasain and tihar...