Check this letter, all the points of it have the references.
There is a clear denie for clueless extraction of some text with have no idea about how to interpretate it.

I understand, that this disarm You completely and You are searching to have this opportunity of text extraction, but You have no study of Quran behind You.

One more time - check the full letter text, it have detailed reference about the Islam position in reference to totalitarian sect crimes.

The people have the right to be religious, but calling them "muslims" or not - give this opportunity to Muslim Study Experts.
If You need the "christian point of view" there is some researcher about the totalitarian sects, and he notice about salafi jihadists.
This is a known totalitarian sect.