Science in Islamic civilization, despite some progress, could not create any serious change or revolution in itself, and according to some authors, it eventually faced stagnation and decline. In this article, we examine and evaluate Ash'arism, lack of material support, and Aristotelian philosophy (methodology) as obstacles to the scientific revolution. We try to show that, contrary to what is generally thought, the Ash'arism were not opposed to reason in the natural world; perhaps, if their intellectual framework were really followed in science, we would witness some remarkable developments in the science of Islamic civilization. While we accept the importance of material support in the advancement of science during the Islamic Golden Age, we try to pay more attention to the methodology of science as other determining factor. By giving some historical examples from Ibn Haytham and the "Zouraghi" astrolabe, we will reconfirm the destructive role of Aristotelian philosophy, and at the same time we will corroborate our contribution in denying the destructive role of Ash'arism.