Earlier quoted context omitted.
> This argument is theological in that it's arguing against an idea, labeling it heresy. I find this use of "theological" insulting and not fitting to the situation. "Ideological" or "partisan" would be better IMO.
Whilst I completely understand why you would find it inappropriate, I'm struggling to see why you would find it insulting. Can you elaborate?
But I often see people labelling disagreements over things like licenses or editors or programming language as "religious" disagreements, with the implication that this means "driven purely by thoughtless adherence to a group and/or authority".
Clearly, religion sometimes works like this. But consider people like mathematician and theologian Blaise Pascal, or literature professor and theologian C.S. Lewis, or any number of ordinary Christians I know who do think critically, including about their theology. Being religious does not necessarily mean holding a position uncritically, being hostile to those with whom you disagree, or being able to acknowledge partial agreement and gray areas.
On the other hand, non-religion can also display the "religious" tendencies people are trying to deride by using this term. Some people are so fervently allied to the Republican party, or Marxism, or environmental causes, or conspiracy theories, or atheism, or white supremacy, or feminism, or any number of other things, that they're unable to consider opposing arguments.
Unthinking herd mentality is neither inherent nor specific to religion.