1. the Islamic name for god is "Allah"
2. Muslims also believe that the Quran, which is the central religious text of Islam, was revealed to Muhammad by God, and that Muhammad was sent to restore Islam, which they believe to be the unaltered original monotheistic faith of Adam, Ibrahim, Musa, 'Isa, and other Prophets.
3. As the birthplace of Muhammad, and the site of Muhammad's first revelation of the Quran (specifically, a cave 3 km (2 mi) from Mecca), Mecca is regarded as the holiest city in the religion of Islam and a pilgrimage to it known as the Hajj is obligatory for all able Muslims.
4.Qur'an
The Qur'an also states that nothing in this world should be dearer to a true believer than faith. Muhammad is reported to have said that he gained sweetness of faith who was pleased to accept God as Lord, Islam as religion and Muhammad as prophet.
the last one i dont know and just for your information im a Muslim :)
i know EVERYTHING! lol