If one parent was different - would you still exist?
Let's say 20-40 years ago, or whenever you were board, take one parent out of the picture and replace them with someone else.
Do you still exist today? And I don't mean as you, but I mean as a conscious being - any conscious being at all? If you think that you would be born as a slightly different person, then surely you should believe in souls because in no way would be it possible because that alternate reality being is not YOU.
And than this made me think... there are 6 billion people on this earth, yet I view reality from this 1 point. I think it's truly unbelievable that I'm somehow a conscious being, because a few changes in my DNA or genes... would that alternate me be any different from say... a brother - who is a separate conscious being? Hell... any slight change and I may have never been able to experience the universe period.
Maybe I would have been another person... but again, how else could this possible unless something like souls existed?