Originally, God was to save individual mind from despair if not disaster, love was an attempt by one mind to possess another mind and justice was a mind's concern for all other minds. In case of the first, mind is too weak and fearful to understand itself. In the second, the nature cripples the reason and over powers human mind! In the third situation, the reason is more evolved and makes the human mind to stand on its own and does what best is possible with respect to other minds!
The strength and weakness of reason is that it imposes a uniform way of thinking and understanding. Hence its usefulness is immediate to society but not to that extent to the individuals in the same society; again the reason evolves all the time. The very evolution happened at differing geographical isolations made individuals with different levels of mental capacity; the uniform force of reason of society threatens individual minds that are not fully evolved to grasp the reason; such minds are weak and only attained a capacity to create questions without an ability to generate answers; having created the questions they are ready to receive any kind of answers instead of handling the reason. The reason is a day to day struggle for them while the religion has been made available as a readymade answer for any circumstances. Hence at the level of society the reason wins but at the individual level of practice the reason often fails and that makes religion to win.
A man actually has two Gods. The one, created him and the other, he created. Nature is not the first God but the first God exists in and as a part of the nature; a man with the help his reason creates a God against the forces of nature that are perceived to be as threat, hence the second God. The second God is the property of an individual mind that created it. A child has no reason and hence it has no second God; but it has the first God not yet known to it because the fear is not felt by the child! The first God is felt and known due to the fear ingrained in the instinct and the second God is the surrender and prayer brought out by the reason!