Considering that is what he claimed, yes. It does.
Thanks for that story. There are psychos all over the place, and they have all kinds of motivations. From the end of your article: "Its members identify themseves as Christians, however, “they are really not Christians in any sense that a christian would accept,” Potok added. Most mainstream American Christians, he said, would find a Phineas Priest’s reading of scripture to be “heretical.” "
A major difference from most "Christian terror groups" and a group like ISIS is that in the case of ISIS, they are more or less interpreting and following their book literally.
Replace Christian with Muslim in that sentence and you'll have the reality, here in the US. Here's another article, which has a section about how groups like ISIS do not follow the Quran literally: https://www.washingtonpost.com/worl...bd195e-ac64-11e4-ad71-7b9eba0f87d6_story.html
Some excerpts that are relevant-
Kuwait’s emir, Sheik Sabah Ahmed al-Sabah, said the “vicious” killing trampled on the values of Islam. Qatar’s Foreign Ministry called it “a criminal act contravening the tolerant principles of the Islamic faith, human values and international laws and norms.”
In Cairo, the head of Sunni Islam’s most respected center of learning, al-Azhar, said the Islamic State militants merit punishments under Islamic law such as “killing, crucifixion or chopping of the limbs.”
“Islam prohibits the taking of an innocent life,” said the al-Azhar grand sheik, Ahmed al-Tayeb.
Here's another one from around a year ago: http://www.aljazeera.com/news/middl...ect-baghdadi-caliphate-20147744058773906.html
I could find more examples about mainstream Muslim leaders decrying ISIS as a group and declaring their beliefs/actions an affront to Islam. Their interpretation simply is not mainstream Islam (or even following the Quran literally), much like those Christian terrorists would be considered heretical to mainstream Christians.