Bah, there's another thing.
What of the concept of 'souls' or spirits?
I'll elaborate. We all control our bodies and minds, we are conscious beings. When we die, do we have a life force that is transferred into a new fetus? I mean, I am me. But, when I die, will I have a new me again? Was I someone before?
I always thought about that and it made me wonder if I was actually someone else. Will I be a different person when I die? And the sad part is, you will probably never find out since your memory will be erased.