We are only offended when Christians try to convert us and tell us that we are damned to hell without Jesus.
But why does that offend you?
I'm not offended by the Muslim who believes exactly the same of me, at least as long as he isn't trying to cut my head off. I'm not offended by the atheist who tells me my belief system is no different from belief in a Great Flying Spaghetti Monster. Amused, and sometimes perhaps slightly annoyed, but not offended.
Why are you offended by the belief system of someone who you believe is wrong, and whose belief has absolutely no effect on you or your life?
I'm not trying to be facetious, I'm really curious why so many Jews seem to be offended by this stuff.