AirApache: So you are saying that for every choice, there is a separate "split" of the universe? That's really far reaching. There would be an infinite number of universes, meaning that in order to time travel, you would have to "jump universes." In effect, you don't really change your past, but the past of some other alternate universe. (That still is alot of universes)
personally its easier for me to beleave in aliens and time travel than it is to beleave in some all knowing all powerfull God.
Personally, it's easier for me to believe in an all powerful God, than to believe in a world of evolution and chance. The Bible says nothing about other planets and possible aliens, it tells us just what we need to know about our world. There might just be life out there...but then they could have gone back in time to take over Earth before we had technology. (or maybe they did, but in a different universe split, ha ha)
~Vintage