Among Ashari thinkers, Fakhr-e-Razi sometimes as a philosopher, considers evil to be non-existential, and in other occasions claims it is existential, just like a theologist. He tirelessly tries to show that human beings have no free will and there is nothing in the world but determinism.
His particular view on unity of divine acts, leads to declining some of the most important philosophical principles, like causality, system of the causes and effecteds, cause-effect necessity, Al-Wahid rule, etc.
As a consequence of these beliefs, free will is denied, and the only way to explain why this constrained human being commits evil acts, is to attribute these actions to God, so avoiding fatal questions. But he neither succeeds in solving the problem of evil, nor delivers a correct interpretation of the unity of divine acts. He doesn’t consider human beings responsible for their actions, and can not explain the relationship between human beings and evil. He also believes that a person’s destiny from birth to death is pre-determined and therefor unchangeable