I think it might cause some to question their beliefs; but, the truly devout will find some way to explain it, or deny it. I think the universe is too vast to actually make contact with other intelligent life; but, I do hope that we find evidence of current or past extra-terrestrial life, intelligent or not, before I die. I am not sure how it would change humanity; but I certainly hope that, overall, it would cause us to have a more humble view of ourselves.

Look up the Drake equation. Imagine the tremendous effort it would take to get here after bridging all the hurdles from abiogenesis to surviving long enough to wrestle with forces that might wipe out your species. Fission for example. Now you see the Blue Marble on the horizon. You had better make damn sure you have the upper hand when want to meet these bald apes. And I'm sure they would. In that light, I would welcome our new alien overlords.

I don't believe intelligent beings from another planet visit regularly, but maybe they visited some time, long ago...is that where the many myths of gods flying across the sky originated?

Many would welcome but in current climate well you know

Watch "The Day The Earth Stood Still", starring Michael Renie & Klatu.....