At its core,

[wufwugy]

It's a crap ideology, designed to tell people who believe in God that they would be lost, immoral heathens if they give up their faith.

As crass as it is, that stems from the idea that it is actually true that without certain institutions, humankind is damned. Religious people believe that certain ideas have been necessary for the healthful construction of their worlds and that those ideas don't necessarily come naturally and instead have to be taught/nurtured. At its most basic, this idea probably isn't wrong.

Any view of history reveals that religions are vehicles of external warfare as much internal moral guidance.

I've heard it said by many Christians that the Bible is the only source of moral guidance.
OK, that's a stupendous assertion, IMO. Let's look at that Bible.
Where is the moral guidance? It contradicts itself a bazillion times, but comes firmly down on a single side with the divorce issue.
How's that Christian divorce rate?
OK.
I see how strongly they feel about moral guidance when it comes to their own actions, as compared to how they condemn others for not following the Bible's moral code.

Lots of people get things wrong. Also, the more devout people get, the less of the problems you express they tend to have. Christian divorce rate has increased a lot, for example, possibly because large swaths of Christianity have become more or less nominal in practice.