Our purpose in life

So what does the Creator, Allah, tell us about our purpose in life? Allah states in the Quran that He created man to be His Khalefah, His trustee on earth (Quran 2:30). Mankinds basic trust, our responsibility, is to believe in and worship Allah:

And I did not create the Jinn and mankind except to worship Me (Quran, 51:56-58)

Very simple! The purpose for mans creation is to worship the Creator. The essence of Allahs message through all of the prophets also was:

O mankind, worship Allah, you have no deity other than Him. (Quran, 7:59,65,73,85; Also 11:50,61,84; and 23:23,32).

Allah further states that He made this life in order to test man so that every person may be recompensed after death for what he has earned:

[He] who created death and life to test you [as to] which of you is best in deed - and He is the Exalted in Might, the Forgiving. (Quran, 67:2)

But in order to worship Him, we have to know Him well otherwise we may form a distorted concept of Him and then go astray. In the Quran Allah tells mankind what He is and what He is not. For example, in response to a question about Allah that was posed to the Prophet Muhammad , Allah instructs Muhammad to give the following reply:

Say (O Muhammad): He is Allah [Who is] One, Allah, the Eternal Refuge. He neither begets nor is born, nor is there to Him any equivalent. (Quran, 112)

It is clear from this that Muhammad is not the author of the Quran otherwise he would not have shown that someone is dictating to him what to say.
Also, Allah has to tell us how He wants to be worshipped, which He does in the Quran. He also tells us in the Quran that all Prophets came with the same identical message to their people - that is to believe in Allah and to worship Him. He also tells us in the Quran that all the people of other religions have deviated from the original teachings of their prophets. This is due to two reasons. The first is that earlier scriptures were not preserved simply because of the absence or scarcity of writing paper and so the teachings were transmitted orally and with time became distorted. The second reason is because the clergy of various religions introduced doctrines that were never there (e.g., the Christian trinity creed was introduced only after the council of Nicea in 325 AD and the Council of Constantinople in 386 AD). Because of the changes that crept into earlier religions, Allah tells us that He sent the Prophet Muhammad as the last and final prophet and guidance to mankind with a scripture that He promised would be preserved forever. Allah provides a test to prove that the Quran is from Him. Allah says:

Then do they not reflect upon the Quran? (i.e. its meanings and its objective) If it had been from [any] other than Allah, they would have found within it much contradiction. (Quran, 4:82)

The Quran is available for scrutiny and investigation by any person to try to find even one error or contradiction in it. In fact this test must be applied to any other scripture that claims it is the word of God.