Personally, we should all aim to be tolerant of others' paradigms. Religions are really just heuristics for how to live, including being sources of comfort based on the idea there is some larger purpose. And aggressively shitting on someone's belief system in passing conversation is a terribly unkind thing to do.

But societally, religion has been used to keep people down for millennia. It continues to drastically fuck up our political environment, like the recent attempts of prohibiting basic medical care. Religion's proper place is that of personal belief system, not as a Schelling point to rally around for oppressing others. Until its malevolent societal power has been neutered, it's not terribly surprising that many of those of us on the receiving end will overreact.

Also for what it's worth, the rabid atheist seems to be a less frequent real-world occurrence than the religious person who won't stop mentioning the concept of god.