This study addresses the main claims of deism based on the first deists, also named as English deists. Though there are some serious challenges about making an absolute judgement on deism, which has a long historical background, it is still possible to discuss the main beliefs of deism. However, approaching the subject with a shallow and overall perspective without considering various perceptions of deism during the historical process would cause both imperfect and inaccurate assessments. In our study, matter of deism which is a particular concern to the philosophy of religion is discussed based on the main approaches of the first deists who have the same or different perceptions on the main beliefs such as God, morality, divine inspiration and immortality. Originally emerging as a serious criticism against the corporate Christianity, deism is actually a belief that substitutes the divine inspiration with reason and natural religion. However, to understand deism thoroughly, the question of “which deism” must be asked. Because in deism, while very close ideas on the God and morality can be found, it is also possible to find very different ideas on the matters of immortality and especially divine inspiration.