Q 2: What is that thing for which Allah innovated the Creation?

A ---Allah the Almighty says: {And We created not the heavens and the earth, and all that is between them, for mere play. We created them not except with truth (i.e. to examine and test those who are obedient and those who are disobedient and then reward the obedient ones and punish the disobedient ones), but most of them know not}. (Ad-Dukhan, 38-39)

He says also: {And We created not the heaven and the earth and all that is between them without purpose! That is the consideration of those who disbelieve!}. (Sad. 27)

He says also: {And Allah has created the heavens and the earth with truth, in order that each person may be recompensed what he has earned, and they will not be wronged}.(Al-Jathiyah, 22)

He says also: {And I (Allah) created not the jinn and mankind except that they should worship Me (Alone). I seek not any provision from them (i.e. provision for themselves or for My creatures) nor do I ask that they should feed Me (i.e. feed themselves or My creatures). Verily, Allah is the All-Provider, owner of Power, the Most Strong}. (Ad-Dhariyat, 56-58)

Reference: 200 FAQ On Muslims Belief - Shiekh Hafiz Ibn Ahmed Al Hakami