psac: yes, this illustrate my point: i believe each of these options are possible, certainly! but they are not equally likely; the chances that he desided to just go away (or was kidnapped, or an accident of some sort happened, or he won the lottery and desided to leave everything) is larger than eg. aliens and God. I will even tend to say the chances God is behind it would be less than the aliens, but i might be colored in that respect.
i cant help but notice the similarity with a certain story in the gospels :-).