This comes down to a matter of faith. The arguments rehearsed could be used for any world religion. It isn't possible to prove or disprove any of the theories or beliefs - they are either accepted or not.

I have had instances of 'knowing' something that I could not possibly have experienced in my lifetime - possibly a past life memory? I'm not discounting that but, at the same time, I won't say for sure that's what it is, because I can't prove it. My belief is that we live many lives but why and for what purpose I don't know.