My argument is entirely secular and philosophical. The basic line of thought is something like this. The universe has an infinite future. Given unlimited time, every qualitative state that has ever occurred will occur again, infinitely many times. This includes the qualitative states that in fact brought about your current life. A sufficiently precise repetition of the right conditions will qualify as literally creating another incarnation of you. Some theories about the nature of persons rule this out; however, these theories also imply that, given an infinite past, your present existence is a probability-zero event. Hence, your present existence is evidence against such theories of persons. Given an infinite past, it is conclusive evidence.