> If this was true, how come the vast majority of Muslims are not blood-thirsty maniacs?
What "this" you mean? What I've written is true, specify what you doubt. Now...
> Or maybe they modernized their religion
There's no "modernization" as such but not every branch is as fanatic as the Wahhabis, the official branch in Saudi Arabia, and the direct religious base for ISIS. Saudis Invest billions in spreading their fanatical Islam branch.
> Why aren't they killing infidels left and right?
https://en.wikipedia.org/wiki/Capital_punishment_in_Saudi_Ar...
"The death penalty can be imposed for a wide range of offences[4] including murder, rape, false prophecy, blasphemy, armed robbery, repeated drug use, apostasy,[5] adultery,[6] witchcraft and sorcery[7][8][9][10] and can be carried out by beheading with a sword,[11] or more rarely by firing squad, and sometimes by stoning.[12][13]"
> Recommended reading: "The Phony Islam of ISIS"
Balderdash, the whole article. One more writer speaking from his ash instead of reading any primary source. How do I know? Because "the Quran is" "a complex and nuanced text that deals with legal, moral, and metaphysical questions in a subtle and multifaceted way" can be claimed only somebody who never read it himself. Nuanced my foot.
I've given one link (Sura 9). Read it and say what's nuanced there. Here another, Sura 111:
"The power of Abu Lahab will perish, and he will perish.
His wealth and gains will not exempt him.
He will be plunged in flaming Fire,
And his wife, the wood-carrier,
Will have upon her neck a halter of palm-fibre."
That's the whole Sura 111. What's nuanced about that? Reading Hadith, you can find that Abu Lahab was Mohammad's uncle who didn't believe in Mohammad's "I've received the message form god" pitch.
And that Sura was from the "peaceful part" of Quran(!). Fire of hell for unbelievers is preached in almost every Sura! Almost only those which are bad retellings of some less drastic Old Testament stories can happen not to mention at least "fire" or "hell" for "unbelievers." I don't care how nuanced is if they should pray five or 18 times per day, the view of unbelievers, Christians and Jews is very clear and repetitive.