To argue, or not to argue

Frstly, this thread is not about proving God exists, or debating evolution, or any of that stuff we already have a thousand threads for. Also this is not a thread about legality (free speech laws are pretty clear already on the limits of what is acceptable), but about morality.
It comes up fairly often in debate that one atheist (that is, someone who lacks belief in thesitic claims) will tell another atheist "whatever man, they aint hurting anyone, live and let live". OK that's paraphrased a bit but the core of the argument is that we shouldn't waste our time as we aren't going to change a religious person's mind, especially over the internet.
We also have theists who claim that challenging some things is basically offensive. Examples of this could be the Danish cartoonists drawing Mohammed and causing massive amounts of protests, or the Fox News "War on Christmas" segments that they go back to year after year.
So the question here is "should religious beliefs be in some way protected from criticism / argument / debate?"
And to a lesser extent, as reflected by the poll options, is if we should be criticising religious beliefs should we only do that in response to certain triggers, or should we be actively challenging religious beliefs even when they are not being actively expressed? Should an atheist start the conversation from a blank slate without any provocation?

It comes up fairly often in debate that one atheist (that is, someone who lacks belief in thesitic claims) will tell another atheist "whatever man, they aint hurting anyone, live and let live". OK that's paraphrased a bit but the core of the argument is that we shouldn't waste our time as we aren't going to change a religious person's mind, especially over the internet.
We also have theists who claim that challenging some things is basically offensive. Examples of this could be the Danish cartoonists drawing Mohammed and causing massive amounts of protests, or the Fox News "War on Christmas" segments that they go back to year after year.
So the question here is "should religious beliefs be in some way protected from criticism / argument / debate?"
And to a lesser extent, as reflected by the poll options, is if we should be criticising religious beliefs should we only do that in response to certain triggers, or should we be actively challenging religious beliefs even when they are not being actively expressed? Should an atheist start the conversation from a blank slate without any provocation?
