It should also be pointed out ISIS does not represent Islam nor does it reflect the diversity of Islamic history. ISIS represents their own theology. The bigotry of the Islamic State or ISIS should be clear to all. Everyone is kafir who is not in their in group.
They are bigots toward Shia Islam, Suffi Islam, most Sunnis in Islam, Christians, Jews and of course polytheists and atheists. The Islamic State members are called nihilistic by some but ISIS is far from being nihilistic their bigotry is based on an extremist ideology of puritanical jihadism.
The bigotry of the Islamic State is based on religious extremism not faithless nihilism.
The heritage of bigotry from the Islamic State comes from some of the salafi and wahhabi fundamentalists who have been preaching and teaching bigotry towards those they deem unbelievers for many years.
Scott Anderson wrote in his book Lawrence in Arabia:
In 1916 TE Lawrence argued in "The politics of Mecca" that Ibn Saud and the Wahhabists posed as Islamic reformists "with all the narrow minded bigotry of the puritan" and ibn Saud and his Wahhabists were hardly representative of Islam. He warned in the politics of Mecca that the Wahhabist sect was composed of marginal medievalists, "and if it prevailed, we would have in place of the tolerant, rather comfortable Islam of Mecca and Damascus, the fanaticism of Nejd...intensified and swollen by success."
As Khalil Gibran wrote,
"I found the blind slavery, which ties the people’s present with their parents past, and urges them to yield to their traditions and customs, placing ancient spirits into the new bodies."
Infidel phobia or polytheistic phobia can be just as damaging and full of bigotry as any other phobia. And if you do not condemn and confront this polytheistic phobia at its roots (the language of militant monotheistic fundamentalism) you will keep ignoring an important variable regarding the problem of ISIS radicalism.
See Islamophobia and Infidelophobia from previous post.