Thank you for the informative discussion.
When it comes to Islam, because it is really a legalistic matter, I recommend Stephen Coughlin’s briefings on YouTube. Though somewhat long collectively, briefings like his Red Pill Briefing present quite well the actual lay of the land, allowing one to set aside the dangerous shallows of mantras about Islam.
In particular, something he made sure to point out in an earlier presentation to the Heritage Foundation (IIRC) is very wise.
He said we don’t need to concern ourselves with what is the real Islam but only need to reference the actual books written by Muslims for Muslims to teach them how to be good Muslims ... books which come with the blessings of scholarly authority and which are on sale in Mosque bookstores all across the country.
Naturally, Sunni and Shia (and others) will have different books as they look to different “authorities” ... but each within their own have texts they turn to. The differences help to show why, for example, so-called lone wolf jihad is more of a Sunni thing.