Jesus is Christianity's main prophet. It all starts when Jesus was given birth to in Bethlehem. Jesus was a Jew, but he preached to others about God and the some of the Roman leaders hated that he was teaching a religion and gaining some followers so he was put to death. A few people claimed to have saw him ascending into heaven or above the clouds; others said that he resurrected physically. The people who saw this happening were called apostles. Through the apostles, Christianity spread. It also spread with the help emperor Constantine 1, because he supported Christianity unlike all the other Roman leaders. Christianity, Judaism, and Islam all believe in one God making them all monotheistic. They also believe in the same God, but they believe in different prophets, making each religion different from the other. Christians have one holy book called the Bible, which talks about the connection with God and Christians as well as what God himself did to Christians. Christians normally worship at church, which is normally led by a minister, pastor, etc. The religious leader would depend on the group of Christians since there are Catholics, Lutherans, etc. For Catholics, it would be the pope. Various sects of Christianity is Catholics, Protestants, Baptists, Eastern Orthodoxy, etc. There are quite a few holidays for Christians such as Palm Sunday (when Jesus arrived in Jerusalem), Good Friday (when he was crucified, or executed on a cross), Easter (when he was believed to have risen from the dead), and Christmas(Jesus's birthday).
The main prophet of the Islamic religion is Muhammad. Muhammad was given birth in Mecca(Saudi Arabia). It is said that he was an orphan and that he was poor. In 610, he started having visions from God that put him in a trance-like position. Not everyone believed him, so many persecuted him for this. He fled to a desert Oasis, where he met a couple followers. Soon, he died without a heir. So his followers split into two groups, the Shiites and Sunnis. Shiites believed that Ali ibn Abu Talib was heir to Muhammad while the Sunnis believed that Abu Bakr, father-in-law of Muhammad; Umar I; Uthman ibn Affan; and Ali, son-in-law of Muhammad.(first four calliphs) All of them have Jerusalem as their holy city. For Islam, it's where Muhammad traveled to the Dome of the Rock, to pray and go up to heaven. For Judaism, it is their homeland from thousands of years ago; it is also where God resided. For Christianity, it was where most of Jesus's story took place. Their holy book is the Qu'ran, which contains the word of Allah, his attributes and his relationship with people, but it also contains materials on the history of this religion such as the prophets, etc. Muslims pray anywhere, but they normally gather at a mosque. Their religious leader is named Imam. The best known groups in Islam is Sunni Islam, Shia Islam, and Kharijites.(there are more, but these are the major ones) Muslims celebrate Ramadan, which requires them to fast. They also celebrate Id al-Fitr, which ends Ramadan and is an event that everybody exchanges presents.