In the symmetry problem of evil, the multiplicity and intensity of evil are used as evidence against the existence of God. According to this, there are terrible evils in the world that an all-knowing, omnipotent and pure good being could prevent, without losing a greater good or allowing a greater or equal evil, but he did not do so; So, the greater the severity and diversity of this evil, the less the possibility of the existence of a pure good God who is all-knowing and Omnipotent. Michael Tolley believes in the problem of symmetry of evil. He believes in the improbability of God's existence by relying on premises such as the plurality of evil, examining the possibilities of the theory of God's existence in comparison with alternative theories, and citing the Lisbon earthquake as the main argument. On the other hand, Alvin Plantinga, in response to Tully, relying on premises such as that theism is the most probable option, because its alternative theories have serious problems, by criticizing two of the premises of Tully's main argument, seeks to prove the existence of God. In this article, an attempt has been made to explain Tully and Plantinga's argument by relying on the library method and then presenting other criticisms of Tully's probability theory.