Unless someone clicked on this topic by mistake, I don't think anyone reading this thread has any valid expectation not to disagree with what it may contain...

(I personally find it just a little offensive when people jokingly refer to things (pets/possessions) as if they are "god" to mock those who have sincere belief in such things.  If you think your dog is god, well that's just great.  But I can't help suspecting that you do not actually think that...) 

Back to the topic...  If aliens do show up someday, what effect would their beliefs have on ours?  If you are an atheist and the aliens show up proclaiming the existence of a "god" or "gods", would you wonder if they might know something you do not?  If you are a person of faith and the aliens show up and claim that they have not believed in a god or gods for some time (or ever for that matter) would that make you question your faith?