The problem manifests itself in Islam, not just in ISIS.
Eliminate the concept of 'jihad' from the geo-political conquest nature of Islam,
and make it an individual spiritual quest rather than one of violence, only then will
Islam will be at peace with itself, it's neighbors, and those who they claim are apostates.
None of that is possible.
L
“make it an individual spiritual quest”
We’ve already got that religion. It’s called Buddhism.
Impossible to do, as the Koran is the word of Allah, and changing it is haram.