In human history, the existence of God has been a subject of contention. To date, human beings have been trying to ascertain the legitimacy of God’s existence (Knight, 2008). Rene Descartes and St. Anselm is considered as the greatest philosophers to question the existence of God. The two philosophers’ findings left a lasting impression on the minds of their followers. Unlike their predecessors, the two philosophers argued rationally and logically on their positions. This paper focuses on the two philosophers’ positions on the existence of God and highlights their similarities. In the book Meditations on First Philosophy, Rene Descartes focuses on epistemic and metaphysical matters (Donald, 2000). Through this, Descartes aimed to shed more light into the being, senses, and answers about God. In the first part of his book, Descartes argues that as a child he had conformed to false beliefs. According to him, he had to eliminate all these false beliefs for him to be knowledgeable. Through this analysis, Descartes questions the existence of God as a supreme being. In his writings, he questions whether God was deceiving him through physical features. To him, he wondered whether the sky, colors, earth, and shapes existed or whether there were dreamed illusions. The third part of Meditations on First Philosophy asserts that after Descartes tried to eliminate his thoughts and feelings, he wondered whether God was deceiving him. He argues that though his questions were unanswered, he still had no reason to doubt the existence of God. According to him, God was a perfect being hence he would not deceive him. Therefore, he perceived that God was all good. According to him, human beings are imperfect while God was perfect. Therefore, he attributed the realities of perfection to God. As such, innate human ideas of perfectionism were derived from Him. Descartes concludes that God’s existence is real as mathematical truths. Many scholars believe that Descartes’ theistic arguments fit into his epistemology. Through his arguments, Descartes presents two distinct arguments on the existence of God. In the first part of his meditation, he highlights that there is a possibility that God was deceiving. He argues that since God was perfect, he could not tolerate errors. Considered that human being’s actions are full of errors, Descartes asserts that no perfect being exists. It should be noted that modern foundationalism is attributed to Descartes. Before him, foundationalism was taken for granted. His writings focused more on answering his skeptics the most critical epistemological issues. He asserted that in our pursuit of knowledge and understanding, humans must accept their subjective psychological states. After that, humans should proceed to argue their perceptions about the external world. Through this, he aimed at defeating his critics by illustrating to them that if they systematically analyze issues, some truths could not be doubted. Equally, through foundationalism theories, Descartes tried to explain the existence of God. In the third part of his meditation, Descartes highlights his beliefs and identifies the beliefs he doubted from those he could not doubt. For instance, he argued that the fact the evil was deceiving him that he did not exist could not persuade him into believing that he did not exist. In the second part of the meditation, Descartes mentions of Cogito. He us