"It is to believe in Allah, His angels, His books, His messengers, and the Last Day, and to believe in divine destiny, both the good and the evil thereof."
Iman is the state in which the heart accepts the Truth and lives by it. It is to believe in its six 'pillars' such that, the lips and tongue make the profession of the truth, and the limbs execute what is required of them by the truth. It is important to recognise that the first of the Prophet Muhammad's titles - his 'titles of Glory' - is not 'Messenger' or 'Prophet' but 'slave' ( abd ). For man must be a slave to the truth before he can be its messenger, and the slave is, by definition, one who submits body and soul to his master, claiming no rights, asking no questions and owning nothing that he can call his own. It is for the master, if he will, to raise him to a higher status.
"Say: [O Muslims]: 'We believe in Allah and that which is sent down to us, and in what was sent down to Abraham, Ishmael, Isaac, Jacob, and the Tribes; what was given to Moses and Jesus and what was given to the Prophets by their Lord. We make no distinction between any of them, and to Him we have surrendered ourselves.'"
The Quran is the last scripture of guidance revealed to man and sent down for all humanity. For the Muslim, God's Book is much more than a source of liturgical and social rules; indeed, such topics occupy less than one tenth of the Quranic text; and it is more even than a revelatory declaration of man's origin and his fate, an exposition of the truths of man's spiritual nature and of judgement. The Quran is-oft recited, at the most profound possible level, because it is of God. Its text reveals God's will for His creation, but it is also a revelation of Himself. It is uncreated, timeless, a dimension of God's pre-existent attribute of speech, communication: it is the Logos, which is the interface between the Absolute and the contingent realms. Unlike all other scriptures sent before, it is Divinely protected against corruption and is thus the only authentic and complete book of Allah which has remained unchanged since its was revelation to the Prophet (pbuh) through the angel Gabriel. It was revealed over a period of 23 years. It contains 114 Surahs (chapters) and over 6000 verses.
A Muslim believes in all the Messengers and Prophets of God without any discrimination. All messengers were mortals, human beings, honoured with conveying the Divine revelations to mankind. The Holy Quran mentions the names of 25 messengers and prophets but according to tradition some 124,000 prophets are believed to be sent. These include Noah, Abraham, Ishmael, Isaac, Joseph, Moses, Jesus and Muhammad.
A Muslim believes in the Day of the Judgement. This world as we know it will come to an end, and man will rise to stand for their final and fair judgement. On that day, the whole of humanity will be resurrected and await reckoning. Every action is being accounted for and kept in an accurate record by the angels and on that Day the consequences of those actions will be brought to light. They are brought up on the Day of Judgement. The people with good records will be generously rewarded and warmly welcomed to Allah's Heaven. People with bad records will be fairly punished and cast into Hell. The real nature of Heaven and Hell are known to Allah only, but they are described by Allah in man's familiar terms in the Quran.