I think you are both wrong on the odds: The odds are not 50-50 in favor of there being an afterlife (or a god, or a superbeing, or ressurection). The odds are 99-1 against for the simple fact that there is no evidence that any of these things exist.
Think about it this way. What are the odds of there being a heffalump? Are they 50-50? Sure, it is possible that there is an animal called a heffalump, and it lives in a remote forest or in the ocean or on mars and we just haven't discovered it. But allowing for the possibility that it exists does not move the odds to 50-50, it moves them to 99-1. The odds are 99% against it actually existing because no-one has ever seen one, but we allow the 1% chance that they exist because you just never know.