Sadly, Europeans of that period were not aware of the many cultures of the rest of the world. The Crusaders knew they were going to fight Muslims, but their idea of Muslims wasn't much more specific than "not Christians," or more particularly, "not like us." The Eastern Jews looked as strange as the Muslims.
they lead the crusades yes. The crusades were an effort to retake Jerusalem.
The rituals surrounding death and burial in Judaism are very specific. The funeral must be lead by either a rabbi or someone Jewish (in non-Orthodox communities, it can be either a Jewish man or woman). Although it might be acceptable for a non-Jew to speak at a Jewish funeral in some communities, it would never be appropriate for that person to speak on behalf of the family.
each crusade was lead by a different person
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Islamic communities and mosques usually have an imam. Jewish communities and synagogues usually have a rabbi. Neither Jewish nor Islamic services require an ordained leader. In both communities, any knowledgeable layman can lead services. Rabbis are expected to know halacha, Jewish law, and imams are expected to know sharia, Islamic law. Rabbis are expected to know the Torah and the associated oral tradition, the Talmud. Imams are expected to know the Koran and its associated oral tradition, the Hadith.
Yes, born as a Jew he now crusades for salvation through his risen savior Christ. Does anyone have a lead on how to get one of his CD's. I have an old one and would like to see what he has new.
much information lost in antiquity was kept by the Arabs, the crusades gave Christian Europe access to this data.
Rabbis teach Jewish law and traditions. Congregations hire rabbis as leaders, both to lead services (although any knowledgeable adult Jew can lead services) and to act as spokesmen for their communities. Rabbis make decisions about matters of Jewish law, leading Jewish courts that oversee such issues as divorce and conversion to Judaism (sometimes, Jewish courts judge other kinds of civil cases where the law allows binding arbitration).
It caused more Africans to be enslaved for work
Each Hasidic Community is different and follows the interpretation of Halakha (or Jewish law) by the lead Rabbi and/or Rebbe of that community. Research Halakha for an idea of these laws (there is no real way to write an exhaustive list without spending eighty hours typing this up).
The crusades had positive effects on Eastern Europe. For instance, it lead to the conquering of the provinces known as the crusader states that provided a new form of trade income.
Yes. Stress can lead to heart attacks. If you are worried/stressed out about heart attacks and have other conditions that could lead to a heart attack- then it is possible.