I view it as "people are people". They can use any ideology or philosophical belief system et al for their personal advantage or for the advantage of others.I think it's complicating it to wrap it up in concepts of metaphor, faith, and justification. This makes it into something roughly amorphous. Apparently things were so unclear that someone like Constantine, for example, would take it be a war religion, and start imbuing shields with Christian symbols straightaway. I think if you can draw that kind of thing out of a religious concept due to mistaken inference, then maybe the concepts in the religion weren't clear enough to tell you what not to do. Which should be pretty concerning, because I think it's better if one knows plainly what they are to do or not do
It is not as complicated as one may think. Though there are nuances, it is basically "love God and love your neighbor".