Ibn al-Rawandi

Abu al-Hasan Ahmad ibn Yahya ibn Ishaq al-Rawandi, commonly known as Ibn al-Rawandi, was an early skeptic of Islam and a critic of religion in general. In his early days, he was a Mu'tazilite scholar, but after rejecting the Mu'tazilite doctrine, he became a freethinker who repudiated Islam and revealed religion.