We are a commune of inquiring, skeptical, politically centrist, capitalist, anglophile, traditionalist New England Yankee humans, humanoids, and animals with many interests beyond and above politics. Each of us has had a high-school education (or GED), but all had ADD so didn't pay attention very well, especially the dogs. Each one of us does "try my best to be just like I am," and none of us enjoys working for others, including for Maggie, from whom we receive neither a nickel nor a dime. Freedom from nags, cranks, government, do-gooders, control-freaks and idiots is all that we ask for.
Islam was still a minority religion in those former Roman provinces at the time of the Crusades. The fact that non-Muslims were taxed lowered the incentives of a vigorous policy of conversion. The Christians in the region looked to neither Rome nor Byzantium for spiritual leadership.
The majority of the inhabitants converted to Islam after the Crusades due in part to the rout of the Crusaders and the introduction of Sufi missionaries with a more mystical ans appealing version of Islam.
Defeating Islam and recovering the Christan lands that existed around the Med and stopping the subsequent invasion of Western Europe and Spain (and France) would have been the single greatest interruption of past history it is possible to imagine.
It would make more sense to worry that winning a permanent victory over Islam might cause George Lucas to decide to direct chapter seven of the Star Wars franchise.
the likelier scenario was what if the Eastern Roman Empire had held on to its north African territory or held on after it it had recaptured these areas from the islams. between the plague and distractions from the West, the loss of north Africa was settled.
The Poetry of Violence