Before answering the question, I need to address the Christian bashing going on here.
As a Catholic, I can tell you this: discovery of life elsewhere in the universe, or even within our own star system would hardly start wholesale slaughter in an interstellar crusade by those pesky Christians.
"In my Father's house are many mansions", said Jesus to Simon Peter and the rest of the disciples. While rather obscure, this sets a biblical precedent for the idea of Church acceptance of the idea of extraterrestrial life.
The idea that Christianity, Catholicism in particular, is any less accepting of the idea of extraterrestrial life is ludicrous, absurd, and asinine.
The Vatican recently held a conference on the idea of extraterrestrial life. The Vatican astronomer said that life on Mars cannot be ruled out.
I believe the discovery of extraterrestrial life, in this instance, non-sentient life, would force a paradigm shift in global thinking. Would it make any of us, Christians and non-Christian alike, feel any less special, or that we had less of a place in the universe? Hardly. What I believe it would do is make us all understand far more clearly just how precious our existence is.
This would be even more intensely the case if we were to receive a message from an extraterrestrial intelligence. Imagine! There are others out there, and we are not alone! I think far from feeling less special we would not be the lonely children we consider ourselves to be. If we did not feel this way, why would we be searching?
As for the world's religions, ALL of them, would this not give greater glory to the creation? Would this not give a greater insight into the mind of the creator? Show the majesty of the vast construct of the Universe?
What these bashers fail to realize, or refuse to accept, is that we ARE something special. All life is special, even extraterrestrial life. If they knew anything about the religions they seem to so despise, they would understand that.
If one is of true faith, then that faith is not threatened by science, but in fact embraces it. Science is the search for fact. Religion is the search for truth.
Why can they not be complimentary?