Looking at the historical data regarding rapture dates, one can see a clear trend. It never, ever, happens. Perhaps he is wise enough to notice this, and decided to pursue a good career; you know....just in case.
“Life is like a grapefruit. Well, it's sort of orangey-yellow and dimpled on the outside, wet and squidgy in the middle. It's got pips inside, too. Oh, and some people have half a one for breakfast.” - Ford Prefect