"scientifically speaking" Energy Doesnt die, it just changes form so I believe there has to be something. I also like to quote contact when a character said something like "if we are alone its an awful waste of space"(paraphrasing).
There is always the idea that Earth is sort of like our pergatory and when we get it right we move on. In that sense I believe in loosely defined reincarnation. I believe if you didnt get it right you get another chance here on earth. I may be crazy to believe this. I believe there are no coincidences and that there is something akin to "fate" in play. There are so many things that have lined up to be like Kismet for me I cant believe that it was all just meaningless and random.