Islam is the one and only religion in the world that believes in one God(Allah). All of its teachings and guidance are written in the Holy Quran (the holy books of Muslims) and Sunnah (the acts and deeds of the last prophet of Isalm). People who follow Islam are called Muslims.All the Muslims believe that the Holy Qur'an was spoken to Muhammad (S.A.W) by the angel Gabriel (the head of all the angels), and that those are the words of their God(Allah). They believes that Muhammad(P.B.U.H) is the last prophet of Allah.
Muslims not only believe in the last Prophet (Muhammad) but they believe in all the previous Prophets Noah, Adam, Jesus, Moses, Younis, etc. Muslims believe that all the Prophet were given the messages and instructions from Allah. They believe that all the contents and verses which are written in the Holy Quran is the final message of Allah until the day of judgment.
But Satan or Devil, forces or tempts the people to do bad things against the messagse of Allah.