Bedrock Islam.

There is a clear relationship between fundamentalism, terrorism, and the basic assumptions of Islamic orthodoxy.

And:

Within the classical tradition, the relationship between Muslims and non-Muslims is assumed to be one of segregation and enmity.

~ Yahya Cholil Staquf, "one of Indonesia’s most influential Islamic leaders."^[1]

Notes
^[1] Yahya Cholil Staquf, quoted in "Can’t we talk? No, we can’t." By Jim Simpson, Bombthrowers, 9/9/17.