Since I don't think that is a rhetorical question, but even if it were others here seem to think that still evokes a reply, I will give my opinion.

The rapture is a biblical concept. Since you are not of the faith, it is quite understandable that you wouldn't understand.

You do, however, have an opinion which you posted here. I would hope that you would have the fortitude to discuss it with them, and get face to face reasoning.

It might help them if you inform them that you don't believe in absolute truth, as well, as I think that will allow them to understand your base of information. Most schools do not employ those not of like faith. I'm not sure what lead you to want to work there, but I hope it works out for you in the long run. TC!