The Crusades changed relationships between Christians and other groups because the crusaders attacked the Jews and the Muslims.
The European Christians in the early 11th century attacked Jerusalem or the Holy land in their bid to reclaim the land for Christians.
However, the city of Jerusalem at the time was occupied by Muslims, Christians, and Jews living together.
When the European Christians reached the city, they fought off and killed the people of other faiths or groups like Muslims and Jews by carrying out the Siege of Jerusalem.
Hence, in this case, it is concluded that the Crusades changed relationships between Christians and other groups because the crusaders attacked the Jews and the Muslims.
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