God is Just and manifest His justice, He established the system of accountability. Those who do good will be rewarded and those who do wrong will be punished accordingly. Thus, He created Heaven and Hell and there are admission criteria for both. Muslims believe that the present life is a temporary one. It is a test and if we pass the test, we will be given a life of permanent pleasure in the company of good people in Heaven.
Like Jews and Christians, Muslims believe that the present life is only a trial preparation for the next realm of existence. Basic articles of faith include: the Day of Judgment, resurrection, Heaven and Hell. When a Muslim dies, he or she is washed, usually by a family member, wrapped in a clean white cloth, and buried with a simple prayer preferably the same day. Muslims consider this one of the final services they can do for their relatives, and an opportunity to remember their own brief existence here on earth. The Prophet taught that three things can continue to help a person even after death; charity which he had given, knowledge which he had taught and prayers on their behalf by a righteous child.
Simply by saying 'there is no god apart from God, and Muhammad is the Messenger of God.' (Click here to see video.) By this declaration the believer announces his or her faith in all God's messengers, and the scriptures they brought.