http://www.mnsu.edu/emuseum/cultural/religion/islam/beliefs.html
Basic Beliefs of Islam

The teachings of Islam are comprised of both faith and duty (din). One branch of Muslim learning, "Tawhid", defines all that a man should believe, while the other branch, "Shari'a," prescribes everything that he should do. There is no priesthood and no sacraments. Except among the Sufis, Muslims receive instruction only from those who consider themselves adequately learned in theology or law.

The basis for Islamic doctrine is found in the Qur'an (Koran). It is the scripture of Islam, written by Muhammad and his disciples as dictated by the Angel Gabriel. It alone is infallible and without error. The Qur'an is comprised of 114 surahs, or chapters, arranged from longest to shortest. For Muslims, the Qur'an is the word of God, and he carrier of the revelation of Muhammad, the last and most perfect of God's messengers to mankind.

In addition to the Qur'an, other documents are also referred to by followers of Islam. A number of additional sayings of Muhammad were complied in the Hadith ("tradition"). The Torat (of Moses), Suhuf (books of the prophets), Zabur (psalms of David), and the Injil (gospel of Jesus) are also studied and considered to be revelations, although they are believed to have been corrupted through time.

Five Articles of Faith

The five articles of faith are the main doctrines of Islam. All Muslims are expected to believe the following:

1.      Allah. Like Judaism and Christianity, Islam believes there is one true Allah (The Arabic translation of the word God). Allah alone is the creator of all the universe.

2.      Angels. Angels exist and interact with human lives. They are comprised of light, and each have different purposes or messages to bring to earth. Each man or woman has two angels who record his actions; one records good deeds, the other bad deeds.

3.      Scripture. There are four inspired books, the Torah of Moses, the Psalms (Zabin) of David, the Gospel of Jesus Christ (Injil) and the Qur'an. All but the Qur'an have been corrupted by Jews and Christians.

4.      Prophets. God has spoken through numerous prophets throughout time. The six greatest are: Adam, Noah, Abraham, Moses, Jesus, and Muhammad. Muhammad is the last and greatest of Allah's messengers.

5.      Last Days. On the last day there will be a time of resurrection and judgment. Those who follow Allah and Muhammad will go to Islamic heaven, or Paradise. Those who do not will go to hell.

The Five Pillars of Faith

The five pillars of faith are observances in Islam which are duties each Muslim must perform.

1.      Creed (Kalima)- One must state, "There is no God but Allah, and Muhammad is the Prophet of Allah." publicly to become a Muslim.

2.      Prayer (Salat)- Prayer must be done five times a day (upon rising, at noon, in mid-afternoon, after sunset, and before going to sleep) towards the direction of Mecca. The call to prayer is sounded by the muezzin (Muslim crier) from a tower (minaret) within the mosque.

3.      Almsgiving (Zakat)- Muslims are legally required to give one-fortieth of their income to the needy. Since those whom alms are given are helping the giver achieve salvation, there is no sense of shame in receiving charity.

4.      Fasting (Ramadan)- During the holy month of Ramadan, faithful Muslims fast from sunup to sundown each day. This develops self-control, devotion to God, and identity with the needy.

5.      Pilgrimage (Hajj)- Each Muslim is expected to make the pilgrimage to Mecca at least once in their lifetime if they have the means to do it and are physically capable of the trip. It is an essential part of gaining salvation, so the old or infirm may send someone in their place. It involves a set of rituals and ceremonies.

A sixth religious duty associated with the five pillars is Jihad, or Holy War. This duty requires that if the situation warrants, men are required to go to war to defend or spread Islam. If they are killed, they are guaranteed eternal life in Paradise.