Why we were created and tested

In the Qur'an Allah tells us we were created: I created the jinn and men only to worship Me. (Letter of Az-Zariyat: 56) As mentioned in this paragraph, the existence of human beings on this earth merely to be a servant of God, to worship and to gain approval. Servitude of man to God is a touchstone during his life on earth. God tests people on earth to split between those who believe and those who do not believe, and to determine who is the best deeds. Therefore, the recognition as "I believe" the evidence act accordingly is not enough. Throughout his life, man is tested in terms of faith and devotion to God, his perseverance in the religion of Allah. In short, tested the fortitude as a servant of God in a variety of conditions and environments. This is revealed by God in the following verse: She's The Turning and Turning to test which of you is best charity. He is Mighty, Forgiving. (Letter of al-Mulk: 2)