Requirements of the Test
[6:158] Are they waiting for the angels to come to them, or your Lord, or some physical manifestations of your Lord? The day this happens, no soul will benefit from believing if it did not believe before that, and did not reap the benefits of belief by leading a righteous life.* Say, “Keep on waiting; we too are waiting.”
*6:158 After believing, the soul must grow and develop through the worship practices prescribed by God.
[10:90] We delivered the Children of Israel across the sea. Pharaoh and his troops pursued them, aggressively and sinfully. When drowning became a reality for him, he said, “I believe that there is no god except the One in whom the Children of Israel have believed; I am a submitter.”
[10:91] “Too late!* For you have rebelled already, and chose to be a transgressor.
*10:91 Believing in God is the first step. Thereafter, one needs to nourish and develop the soul through the practices of worship (see Appendix 15).
Appendix 15 – Religious Duties: A Gift From God
“When Abraham implored God in 14:40, he did not ask for wealth or health; the gift he implored for was: “Please God, make me one who observes the contact prayers (Salat).” The religious duties instituted by God are in fact a great gift from Him. They constitute the nourishment required for the growth and development of our Souls. Without such nourishment, we cannot survive the immense energy associated with God’s physical presence on the Day of Judgment. Belief in God does not by itself guarantee our redemption; we must also nourish our souls (6:158, 10:90-92). Additionally, 15:99 states that observing the religious duties instituted by God is our means of attaining certainty: “Worship your Lord in order to attain certainty.””
http://www.quranalone.com/the-quran/appendices/appendix-15.php
Quran Talk Blog 