Methodological Naturalism in Science

Methodological Naturalism is one of the basic assumptions of Natural Sciences. many believe that this assumption has no logical relation with ontological naturalism that denies the existence of any supernatural entity-including God. in this paper, first, the relation between methodological naturalism and ontological naturalism has been elucidated and for that, the role that methodological naturalism plays with Ockham's Razor for supporting ontological naturalism has been explained. then, after analyzing methodological naturalism, would be clear that not only this assumption has anti-theological direction, but, in respect of scientific and philosophical scrutiny, it is under question, too, and should not accept a priori. this presumption would imply the impossibility of arguing for Divine action and in the next step can raising the atheism. thus, because of science pursues the truth, it must not foreclose the possibility of assessing the other theories about the world that are not only using materialistic conceptions of the world.