It don't surprise me none. If a majority of Americans ARE religious, and if being religious 'usually' involves thinking everyone should also be religious, then it stands to reason that those who resist religion would be considered dangerous and be mistrusted by many.

Sadly, just a few atheist extremists have been so obnoxious about their non-belief that many Christians view them as a threat. (Never mind that obnoxious, extremist religious ranting and threats are often tolerated as just 'exuberance')

Bumper Sticker (which I would NOT put on my car, both because it is not friendly, and because it would be dangerous for the car)