JonNYC: why worry about being on the wrong side? If he's really a missionary helping children, he is (a) used to rejection and (b) able to overcome it.
I have much respect for people who live their beliefs. Much good comes from that. Still, many "missionaries" here just want to pester you (or the Ukrainians, poor folks) into their own beliefs.
I have gotten tired of explaining to my esteemed fellow citizens in KY that the deal is that they can believe any idiotic, superstitious, ignorant thing they want, and that I CAN believe any idiotic, superstitious, ignorant thing I WANT.
If you truly believe everyone respects freedom of religion in this country, don't drive a car to Lexington with a "Darwin" bumper sticker. You might need a new paint job.