As a born sceptic, i'm afraid that the whole reincarnation thing is just another selfish way of thinking you can hang on to life. So much of all religions is about control, power and making money by keeping people living in fear of their own mortality. They are all tied into the very earliest superstitions of man linked to sun worship, fertility and the seasons. The basics of life. We, at an RC school danced round maypoles every year dressed in white for example...there are harvest festivals in churches, Xmas itself being held in the depths of winter is a throw back to ancient pagan festivals which were in place before the Christian church came into being.
People believe all sorts of weird things, that's OK by me a long as they don't try to shove their beliefs down my throat or impose them on the masses. What if Scientology takes over the world? Tom Cruise is a great ambassador for this silliness. We'd all be looking back up to the stars which is what our ancestors did many thousands of years ago....
I'm sceptical about the agenda of the Zeitgeist films but the following is interesting as it shows the links between the main religions and the earliest froms of sun worship -ignore the annoying tones of the voice-over and give it a few moments to get going and you may find it quite surprising....
(As i was writing this, and getting interupted, I see Margaret and Garinda have written again both mentioning spirituality in one way or another. To me spirituality has nothing to do with religion it is a knowing of the self and understanding how the elements that make up our-self can be completed by the others with whom we interact. It is a very personal human thing....as we progress in life we find those around us who compliment who we are and can make us our whole-selves.)