Christianity is Monotheistic- belief in one god. The Holy Book is the Bible. They had to pay a tithe. The church had absolute control over people during the Middle Ages. People had to get the sacraments from the church in order to go to heaven. If they did not get sacraments or pay the tithe the church would excommunicate them.Christianity is the cross, or crucifix, symbol of the death and resurrection of Jesus Christ.
The Crusades were military campaigns sanctioned by the Latin Roman Catholic Church during the High Middle Ages and Late Middle Ages.Crusades were called against Frederick's illegitimate son Manfred, king of Sicily. the Crusades and other holy wars was that the authorization to carry out these wars came directly from the pope, who claimed to be working on behalf of Christ.
The Ten Commandments, also known as the Decalogue, are a set of biblical principles relating to ethics and worship, which play a fundamental role in Judaism and Christianity. They include instructions to worship only God and to keep the sabbath; as well as prohibitions against idolatry, blasphemy, murder, theft, dishonesty, and adultery. Different groups follow slightly different traditions for interpreting and numbering them.