Quite a culture we live in where encouraging people to learn about another's faith will get you fired.

I think it would be equally as bad if the pilot had said "Who on this plane is an atheist?" and encouraged those people to espouse the atheist viewpoint to the theists onboard the plane.

For that matter, I think it would be equally as bad for the pilot to have said "Who on this plane is a fan of rock music?" and encouraged them to talk to the country music fans and tell them how stupid they are for not liking rock music.

I think in all cases, it would have been inappropriate for the pilot to espouse his own viewpoints like that, and should find another line of work.