The two great branches of Islam can, by analogy, be understood as similar to Protestantism (Sunnism) and Catholicism (Shiism) in Christianity. This analogy is extremely inaccurate, of course, but maybe it helps understand some of the basic divisions.
I personally have always found Sunnism more like Catholicism, and Shiism more like Protestantism -- because Shiism, like Protestantism, has a tendency to schism, while Sunnism and Catholicism historically tend to be less purist, more sloppy and accommodating of local variations.
Wahhabism, from this POV, is *highly* aberrant Sunnism, and can be predicted to have the same tendency toward schism that Shiism has.
Your analysis of Trump's narcissism tracks very closely with psychiatrist Propane Jane's, but she also sees signs of progressive cognitive impairment.
I personally have always found Sunnism more like Catholicism, and Shiism more like Protestantism -- because Shiism, like Protestantism, has a tendency to schism, while Sunnism and Catholicism historically tend to be less purist, more sloppy and accommodating of local variations.
Wahhabism, from this POV, is *highly* aberrant Sunnism, and can be predicted to have the same tendency toward schism that Shiism has.
As you say, the analogy isn't exact either way.