This research discusses the most important pieces of evidence put forward by Ash'ari thinkers on two very important issues: formation of the world and the idea of causality. Depending on IbnRushd's reading, the paper also highlights the most important loose and weak points Ash'ari inferences. Ibin Rushd, a pioneer of the intellectual trend in Islamic philosophy, saw in the treatment of these two issues represented an epistemological obstacle faced by Arab-Islamic mind and stood between it and the causal understanding of the universe. The philosopher Averroes sensed the danger of the absence of objective consciousness of the universe and the nature in Arabic and Islamic philosophy. In an attempt transform society from a state of theological submission to one of scientific certainty, he tried to lay the ground for a vision depending on the mind.