There is a strain of libertarians who revel in their atheism, such that they actively go out of their way to offend theists. They might explain their consistency along the lines of, “I respect no rulers or gods.” Or they might say, “At this blog (Facebook page etc.), there are no sacred cows.”
That has never been my approach, even when I was an atheist. When my Jewish neighbors invited me over for a meal that had religious overtones, I was constantly asking (discreetly) things like, “Is it OK for me to drink that?” to make sure I didn’t unintentionally offend their guests.
Even taking the metaphor literally, if I were in a group of devout Hindus, I would do my best not to disrespect cows in front of them.
People might respond to the above by saying, “But you need to confront error wherever you find it!” OK, but I don’t think insulting people is the way to change their minds. I have literally had agnostics email me and say words to the effect, “I don’t believe in God, but the Sunday comments at your blog are so obnoxious when atheists gang up on you, it almost makes me.”