Historically, Islam teaches that Allah has decreed all things, good and evil from eternity, all that happens, whether obedience or disobedience, faith or infidelity, sickness or health, riches or poverty, life or death. This article of faith was added after the death of Prophet Muhammad peace be upon him and so is not considered to be from the original articles of faith.

The belief in predestination has been the subject of many debates, arguing whether a person is therefore responsible for his actions if Allah has already willed that person to be a certain way. Others refute that though Allah has predestined all things, a person can change their destiny, for instance a muslim who doesn't practice his faith and Allah has sentenced him to Hell, if that person tries to become a better muslim and be more devout, Allah can change that persons destination to Paradise, if he wills.

All final decisions rest with Allah.

Inter-Islam - www.inter-islam.org

Wikipedia - www.wikipedia.org