I suppose the concept of spirituality comes in to play, given this discussion about the probabilities of intelligent alien life, but it wasn't my intention to drive the conversation in that direction.
The short answer is, it's my belief that a living, sentient spirit, animates every intelligent life form in the universe.
To me, it is difficult to talk about life on other planets without considering the possibility of life on other plains (e.g. God, angels, etc.). They are interconnected.
Do I believe in life on other planets? It is totally possible. Do I believe in a divine God? I most certainly do.