Offending 'devout' students

If you are school teacher in US, you'll have to be careful.

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I suppose you mean what would be the response of scientifically literate when someone, presumably religious and unscientific, calls big bang (or better yet, biological evolution) as non-sense.

The response would certainly not be a lawsuit. I, for one, would not be offended as evolution is not matter of faith for me. My belief in evolution is based on evidence and science. There is not room to take offense in science, only the path to better understanding.

And most probably even if you file a lawsuit nothing will happen to that man, because though hurting religion is against law, hurting science violates no law (in India, at least).
How is it in the western world?