What one thing would disprove Christianity to you?

[downbeatplumb]

According to who? If we all naturally die, and the "after bit" happens to all of us. That makes it apart of nature.

Why do you assume you or rather 'we' have a complete understanding of nature?

So you are suggesting that the "afterlife" is part of nature and not "supernatural". Interesting.

I can see why you would find the prospect of living after death alluring. But that there is something vital that lives on is just so obviously a piece of wishful thinking that it really doesn't stand up to scrutiny.