Somebody has taken an ISIS propaganda clip and injected a new translation, one that completely mocks their mindset.
I can see one commenter in YouTube observed “Hey, I speak arabic and this is not what they are saying?” … er well yes, that’s the point, this is designed to mock them, not promote them.
(Apparently YouTube took their version down, so here is the live leak copy)
You might also wonder if satire like this is an appropriate response. I’d argue in reply that it is perhaps the best possible response. Engaging on an intellectual level to combat an utterly absurd and complete irrational psychological state of mind will not be effective; mocking them is instead a far more effective means of breaking that spell.