The Crusades were a series of wars aimed at conquering the Holy Land.
No. Crusades were only by early European Christians.
After the Crusades the European Christians returned to Europe with many ideas and knowledges from the Middle Eastern Islamic Lands... this began the Renaissance in Europe which took them out of their Dark Ages
Infidels Correction: Muslims called Christians Infidels. Christians called Muslims Saracens.
Jerusalem.
This is a hard question to answer. Spain had Christians, Muslims, and Jews during the Middle Ages, but Christians and Muslims were in greater numbers than Jews. It is hard to know whether Muslims outnumbered Christians at some times, particularly around the year 800 or so. Earlier in the Middle Ages and later, in the Late Middle Age, Christians were in greater numbers.
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Christians and Muslims !
After the Crusades the European Christians returned to Europe with many ideas and knowledges from the Middle Eastern Islamic Lands... this began the Renaissance in Europe which took them out of their Dark Ages
No. There are substantial (but declining) populations of Christians and Jews in the middle east. Not entirely, but close. The overwhelming majority (>90%) of Middle Easterners are Muslims. Jews, Christians, Druze, and Baha'i make up around 7-8% of the Middle East cumulatively.
Muslims are commanded to love and respect all.
They fight in the Middle East, but, get along elsewhere in the world.
Yes, of course. They are already friends except when Muslims get attacked by Christians then Muslims have to defend themselves. Another view: In many parts of the Middle East today, Christians are being persecuted and murdered by muslims. They have to either convert to Islam, flee, or die. It's not the Christians doing the attacking, but groups like ISIS.