I made a mistake in my response. I was thinking 'religious slurs' and instead typed 'racial' confusing in my head how some religions are conflated or associated with a particular race of people. Additionally, yes, I also confused the straw man and ad hominem logical fallacies. Despite those mistakes of mine, I'm not sure that the intent of my comment was entirely out of line. My point was that, whether religion is a choice or not, it is not relevant to most discussions. Perhaps that may be where someone's morals are based, but unless it has direct bearing in a debate, it has no place in it.
For example, I would not disparage your religion or beliefs if we were having a discussion on what to do about abortion. If the argument being made by a religious person is factually wrong (an IUD is an abortifacient, a position not commonly held by anyone in the medical community) then that point can be refuted WITHOUT calling the person a dumb, blind sheeple. No where in that particular, religiously-charged argument is the position being held that religious adherents personally are being required to do something against their faith (i.e. not required to have an abortion). Other topics are subject to majority choice and Constitutional validation, such as "can a company have a religion?" or "can an employer push their beliefs (religious or otherwise) on employees through their compensation?"
Even if they don't accept commonly held facts, then it is STILL irrelevant what their religion is, because there are more than a few stubborn, atheist and agnostic individuals. Religion doesn't necessarily make you stubborn. They were stubborn before, They are just trying to validate that stubbornness with a reason (God says so). And whether or not the 'common state' is people insulting people, I find it necessary to be better than that, even if it currently fails.