I do not think the discovery of life on another planet would destroy religion as some might believe, that's a social construction. On a universal scale, we cannot be 100% certain that either aliens or God exists, so the existence of one would not disprove the other. To me, discovering extraterrestrial life could prove the existence of a divine power.
Now I'm an atheist but I have read the bible and in it we were made in the image of god how can an alien of another world who would only have to resemble us by ( graspers intelligence comunication ) also be in gods image and why would Jesus die for us only on earth . . Why would god only talk a out how he created earth .