I believe in extraterrestrial life forms yes.  From my recollection that's pretty much been proven anyway, I think, as we've found evidence of microbes.  So if it used to exist, i'm pretty certain it still does, somewhere.  Do I believe in aliens who visit earth to torture children, mutilate cows, and rape unsuspecting farmers?  Not so much.  I believe in the power of the human imagination fully though.