How can we rationally and scientifically explain that ‘humans are too insignificant for God to send them a messenger’?

Allah has made the universe and its laws to function for the very existence of human beings. Hence, in this perspective, humans are ‘central’, not in a physical or spatial perspective but in an ‘existential’ perspective. Had the laws of nature, celestial distance and coordinates in space not been the way they are, life on earth would not be possible.

This principle is advocated by people who believe in God. The universe is created for us, and the laws and its designs reflect this. Those who advocate the principle of intelligent design do so to prove a creator, but do not actually prove further because it is beyond their scope. The link below gives a good insight on the how an intelligent design (by the Creator) shows the significance of the human race on planet Earth, implying the importance of sending messengers.

http://www.goodreads.com/book/show/485781.The_Privileged_Planet?auto_login_attempted=true