Assuming they did find some signs of life, I don't think that would obliterate religion, so I don't understand your title. Religious people, especially Christians, have been dealing with the "oh my god aliens" line of thought for decades. There is even a famous painting (can't remember the name) where people claim there is a "ufo" present in the background. Do you honestly think religion could not simply adapt as it has been doing for centuries?

It doesn't matter what kind of evidence is found to support a more scientific perspective on the origins of our universe. The truth is, no matter what kind of truth is presented, those who do not possess an open mind will still reject the idea. So long as people continue to blindly follow their faith, religion will exist in spite of what kinds of scientific discoveries there are.