How Christianity and Islam were emerged in medieval Europe?

Answer:

Christianity and Islam were the two biggest religions (Judaism was third) in medival Europe. The Christians saw the Jews as sinners because "they killed Jesus" and the Islamics as infidels who worshiped a false god. Islam was actually theonly peaceful religion... until they cast the Christians out of the holy land. This started the Crusades, which boosted both religion's honor, since anyone who died in the crusades went to heaven.

First answer by Slvrocarna. Last edit by Slvrocarna. Contributor trust: 5 [recommend contributor recommended]. Question popularity: 2 [recommend question].