Pure horse-pucky and irrelevant. Christianity moved up out of medieval barbarity, the Muslims have descended further into it.
The Crusades lasted 200 years; Jihad lasted 500 years before the crusades and 700 years afterwards.
And the Jihad "rested" only when it became impotent to continue due to military defeats.
After resting for 100 plus years, oil revenues has allowed it to reawaken and is back with a vengeance.
Everyone can do the following: see how many books can be found on the Crusades, vs the number that discuss Jihad...
Jihad and Islam is the invisible world cancer.