OK as you ask, I think what you are referring to is the practice of some Islamic cultures to preach to the Hadiths - variable sets of documents with differing extrapolations of the ambiguous Koran. But core Islam is the Koran and it most certainly does not have the Bible's obscenities of god ordering captured women and children to be killed except for young girls who were to be used as the god empowered victors "saw fit". Nice.
And yes you do get some appalling ostensibly christian and jewish preachers. Mainly overseas but Paisley had his moments.
But here's where I really come from. I've met countless muslims over the years, unlike some supposed christians, not one has ever threatened me or advocated violence to others on religious or racial grounds. Some have been damn good colleagues. One I will always be in debt to for going out on a limb to act to save the life of a relative of mine. I am never going to just sit by and see those people demonised by that white supremacist Weston just for them following the gist of the Koran, just like most Christians follow the gist of the bible and are good people too.
Weston and his cohort the football thug Lennon/Robinson have been and remain Trouble with a very big T.