Although many people, are convinced by the complexions of day to day life and that someone must have had some degree of input. For such perfections of life to fall randomly and by chance are viewed as near impossible. From a Christian point of view, the bible can be used to answer some of the atheist objections of why God allows suffering in this world. Some may interpret the bible to say, suffering is a test, some of us must suffer for the greater good. Jesus was nailed to the cross to prove he is everlasting (the greater good). If there is no suffering in our life how can one appreciate the good times. Therefore if the purpose of humanity is to achieve good, they need suffering in order to appreciate the good in a greater manner. Suffering may also be a part of our humanity, as a consequence of sin. An example to relate to our daily lives, jail is a perfect example of suffering. A criminal must suffer and reflect on what they have done to receive this suffering. Humanity needs some sort of fear to stop evil. Relating back to the omniscient part of God, it may be that suffering and other unknown purposes of humanity are far beyond human understanding and knowledge.
In conclusion, I do not believe God created humanity for any purpose as there are too many flaws in why he would do so. As I have used the example of suffering, the bibles rebuttals are far too weak to give a well reasoned explanation, simply ‘being out of our knowledge as humans ‘ seems to bypass the original question on the whole.