Your knowledge of Crusades is severely lacking
The accounts of the Crusaders and especially the accounts of priests who accompanied the soldiers are filled with paens to martyrdom in battle with the "Turks", such as Peter Tudebode who wrote of one battle during the First Crusade, "More than one thousand knights or footmen martyred on that day rose joyfully to heaven and, bearing the stole of customary white-robed martyrdom, glorified and praised our triune God in whom they happily triumphed."
and the article you posted is under a paywall. Try again please.
Funny, it works just fine for me.
Certainly. It's the only one that claims national sovereignty like ISIS though.
ISIS claims national sovereignty because no Muslim state will claim them, and ISIS themselves are violently against all of those other Muslim states.
Northern Crusades began some 550 years after Egypt fell to Muslim invaders. How wide is your net of "around the same time" anyway?
Narrow than yours, which extended all the way up to 1453.
Nope, because they were repressed under Islamic rule for so long, which bred frustration and hate of anything foreign.
You know, kind of what is currently used as an excuse for Islamic terrorism these days? People look at Muslims with distrust, which drives them to commit violent acts against the infidels.
Now replace "looking at you with distrust" to "daily humiliation of a life as second-class citizen", and you can clearly see that Spain could've turned far, far worse than it did.
Your little "theory" has a couple of fatal flaws.
First of all, the Reconquista (and the expulsion edicts that resulted) came not from Christians inside al-Andalus, but Christian states outside it that had never been ruled by Muslims. Christians within al-Andalus and on the borders had no problem fighting for Muslim rulers even against the Christian states outside Muslim territory (and, indeed, it was common for the patchwork Muslim and Christian states to ally with one another against other Muslim and Christian states which had also allied with each other). Even the great hero of the Reconquista Rodrigo Diaz de Vivar, lionized by the Spanish as El Cid, spent six years in the service of the Muslim rulers of Zaragoza, fighting against the Christian King Sancho I of Aragon and Ramon Berenguer II, Count of Barcelona (even holding the latter captive for ransom for his Muslim master).
Second of all, your idea that the Spanish Christians killed and expelled the Muslims in the territories they conquered because the Muslim rulers treated them poorly doesn't explain why the Spanish Christians expelled and killed the Jews in those territories as well.