Most of the Arab and Persian Philosophers or Theologians were not religious.

 Most of the Arab and Persian Philosophers or Theologians were not  religious.

By Naeem Khan

Study their lives and most of them were rationalist or Mutazilites. Most of them were declared infidels.  A of them were influenced by Greek Thought. 

Study Al- Razi. Many sources claim that al-Razi viewed prophecy and revealed religion as unnecessary and delusional, claiming that all humans have the ability to access and discover truth (including the existence of God) through God-given reason. According to these sources, his skepticism of prophecy and view that no one group or religion has privileged access to the truth is driven by his view that all people have an equal basic capacity for rationality and discovery of truth, and that apparent differences in this capacity are simply a feature of interest, opportunity, and effort. Because of his rejection of prophecy and acceptance of reason as the primary method for accessing the truth, al-Razi came to be admired as a freethinker by some.Goodman 1960–2007

During his life, al-Kindi was fortunate enough to enjoy the patronage of the pro-Mutazilite Caliphs al-Ma'mun and al-Mu'tasim, which meant he could carry out his philosophical speculations with relative ease. In his own time, al-Kindi would be criticized for extolling the "intellect" as being the most immanent creation in proximity to God, which was commonly held to be the position of the angels. He also engaged in disputations with certain Mutazilites, whom he attacked for their belief in atoms, as not all Mutazilites accepted the belief of atomism. But the real role of al-Kindi in the conflict between philosophers and theologians would be to prepare the ground for debate. His works, says Deborah Black, contained all the seeds of future controversy that would be fully realized in al-Ghazali's Incoherence of the Philosophers.

Only 14 names may be there in 1400 years! There should have been many in the early years of religion as people are usually more religious in the beginning of a religion.