Most of the crusades we think of were wars with Christians on one side and Muslims on the other, so the answer would be Christianity and Islam.
There were other crusades, however, with other religious intent. The Albigensian Crusade was one of several against Christian heretics. The Hussite Crusade was against protestants (Catholic vs. Protestant).
There were crusades against pagans (Christian vs. pagan), and there were crusades against Mongol hordes (Christian vs. Mongol). There was even one crusade, the Aragonese Crusade, which was really a war between the Pope and the King of Aragon over possession of land.
While there is conflict in Israel now and there was conflict in Israel during the Crusades, it is not as if the current Israeli-Palestinian Conflict is an extension of the Crusades. It is being fought by very different people for very different reasons. There have also been long periods of relative peace in the region; no major war broke out in that area from 1500-1900. The Related Question below discusses the differences between the modern conflict and the Crusades.
The First Crusades was triggered by the movement of Muslim religions into the area of Jerusalem. The First Crusade was declared in 1905 by Pope Urban II.
It depends what you mean by "Palestine". If you are referring exclusively to the Palestinian Territories, there are abuses by Muslim Palestinians of Christian Palestinians and the defacing of their holy sites and monuments. Additionally, there is a conflict between Jewish Israeli Settlers and Israeli Soldiers and Palestinians (both Muslim and Christian). If you are using "Palestine" as a shorthand for "Israel and Palestine", then the religions in the conflict are Judaism, Christianity, and Islam. However, those religions are not at conflict. The Israeli-Palestinian Conflict is a ethnic/nationalist conflict where religions are used as ethnic identifiers (similar to the 1990s in Yugoslavia). It is not a theological conflict.
During the Crusades, the relationships between Christians and Muslims were characterized by conflict, violence, and religious tension. Both sides viewed each other as enemies and fought for control of the Holy Land. There were instances of cooperation and trade, but overall, the interactions were marked by hostility and distrust.
I'm afraid, that no matter where I check, I cannot find any reference to anyone named Eleazar during the Crusades.
During the middle Ages, the two primary religions in conflict during the Crusades were Christianity and Islam. Forces from each side fought for many reasons, and many of them religious: each side wished to influence the other on behalf of their own religious convictions.
The Crusades were mainly a series of military campaigns between Christian powers in Europe and Muslim forces in the Middle East. The conflict arose due to religious and political tensions between Christianity and Islam during the medieval period.
The Crusades were holy wars fought between Christians in Europe and Muslims in the Middle East between 1095 and 1291.
While there is conflict in Israel now and there was conflict in Israel during the Crusades, it is not as if the current Israeli-Palestinian Conflict is an extension of the Crusades. It is being fought by very different people for very different reasons. There have also been long periods of relative peace in the region; no major war broke out in that area from 1500-1900. The Related Question below discusses the differences between the modern conflict and the Crusades.
While there is conflict in Israel now and there was conflict in Israel during the Crusades, it is not as if the current Israeli-Palestinian Conflict is an extension of the Crusades. It is being fought by very different people for very different reasons. There have also been long periods of relative peace in the region; no major war broke out in that area from 1500-1900. The Related Question below discusses the differences between the modern conflict and the Crusades.
The Crusades was Primarily targeted at the Muslims by the Christians. Jewish people that lived in Muslim conquered lands were also killed during the crusades because of their rejection of Jesus.
The Crusades was Primarily targeted at the Muslims by the Christians. Jewish people that lived in Muslim conquered lands were also killed during the crusades because of their rejection of Jesus.
the purpose of the Crusades is to free the Holy Land of the Muslims. To convert religions to Christianity!
The two rival religions involved in the Crusades were Christianity and Islam. Christians from Europe launched military campaigns (Crusades) to reclaim holy sites in the Middle East from Muslim control.
The main religions involved in the Crusades were Christianity and Islam. The Crusades were a series of religious wars initiated by Christian armies to regain control of the Holy Land (Jerusalem) from Muslim rule. The Crusades were motivated by a mix of religious fervor, political interests, and economic factors.
The conflict during the Crusades led to significant changes in European society, politics, and culture. It facilitated increased trade between Europe and the East, introducing new goods and ideas, which contributed to the rise of a merchant class and the eventual onset of the Renaissance. Additionally, the Crusades weakened the power of feudal lords and the Church, leading to the centralization of monarchies and a shift towards nation-states. The interactions between different cultures during the Crusades also fostered a greater exchange of knowledge, influencing art, science, and philosophy in Europe.
Because certain people believe in certain things...?