Funny how all the terror and murder done in the name of Muhammad and Islam....while Muslims are waving their Korans and citing verses from it, squealing "Allah Akbar!"....shooting innocent people point blank range................"ain't Muslim"!
Maybe this is all a terrible mistake and they're doing it for Bhudda? Ha ha ha.
ISIS is Islamic, but not Islam. Clear now?
They are engaged in jihad. By definition jihad is a Holy war. You can't take religion out of the definition.
No, a jihad is a struggle. It can mean war but it means to struggle:
Jihad: A Misunderstood Concept from Islam - What Jihad is, and is not
There is a greater Jihad and a lesser Jihad. Scholars are still debating over the Prophet's quote.
The Greater Jihad controversy
The Prophet is said to have called the internal Jihad the "greater Jihad".
On his return from a battle, the Prophet said: "We are finished with the lesser jihad; now we are starting the greater jihad." He explained to his followers that fighting against an outer enemy is the lesser jihad and fighting against one's self is the greater jihad (holy war).
This quotation is regarded as unreliable by some scholars. They regard the use of jihad as meaning 'holy war' as the more important.
However the quotation has been very influential among some Muslims, particularly Sufis.
BBC - Religions - Islam: Jihad