"There has not been any sort of global jihad going on since 622, as this thing suggests.
Yes there has.
It has ebbed , but it has never quit ,the scripture involved hasn't changed and the Wahabbi want the ebb to change to a flow.
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So effing what?
It won't change.
What we are seeing now is something like the Spanish in the 1500's exhausting their considerable resources to spread the Holy Mother Church all over the place. They beat the crap out of the Turks at Lepanto, but their technical incompetence and bad luck, in the form of weather in the Irish Sea, defeated the Armada in 1588.
They did not defeat Ottomani Islam, though they did prevent it from claiming the Mediterranean. Their aid to Catholics in Flanders and Germany failed miserably.
When you say Wahabbis, you mean Saudis, and notably the devout ones with money, since other Saudis do not count because the Kingdom doesn't allow them to count. That is very, very few people.
What should happen is an immediate and definitive change from petroleum-based energy to other sources. We could start by allowing the unrestricted and untaxed flow of Brazilian alcohol into the US. Guess who opposes that? Brazilians are a mild people who would never attempt to foist their religious views (which are varied and divergent) on even one another.
To sum up, what we are seeing is not resurgent Islam. We are seeing the twitches of a backward and fanatical system in its last attempts to stay alive.
Never underestimate the Flesh Pits of Babylon. They did managed to swallow up ten of the twelve tribes. Unless, you believe with the Mormons say, of course. But then again, the Injuns swallowed them up.