As we know, polygenesis is a theory that believes that human origins come from different lineages. Co-adamism is one of the branches of polygenism. Co-Adamism is a theory that God created other humans besides Adam and Eve at the same time. Co-adamism or often called double-adamism is a theory developed by Henry Home, Lord Kames of Scotland. He began with languages ​​and the origins of man, then he theorized that the new world had arisen under the sea. Kames's view came after examining the differences between men, and he arrived at the conclusion that these differences were so great that men could not all be in the same race as others. He saw all the differences in their faces, their hair, their skin, their shapes and their basic moral qualities. He then reasoned that God must have created many types of human races called multiple adamism, referring to the external and internal differences that each human possesses. So, we can say that co-adamism is a theory that there were other humans of different races besides Adam. and Eve as the first people on earth. He believes that there are other races, referring to the major differences that every human being possesses. Co-Adamism also constitutes a plausible vision for the Christian. Kames himself strove to bring his theory into line with the teachings of the Bible. Another scholar who believed in co-adamism is Giordano Bruno (1548 – 1600). He is a co-Adamist who believed that an infinite number of Gardens of Eden existed in Adam's time. In 1591, Giordano Bruno stated that because it is impossible to imagine that Jews and Ethiopians came from the same ancestry, God certainly created different Adamses. Charles White was another proponent of co-Adamism, but he used science to support his view. White's account of the regular Gr...... middle of paper ......confirms that the skull could be one of the evidences for differentiating human races, he differentiated the size of the skull then he also divided brain size. Like Cuvier, Morton is also a supporter of the theory of polygenesis. According to Morton's theory, he attributed the highest brain capacity to Europeans, followed by Chinese, Southeast Asians, American Indians, and the smallest capacity to Africans and Australian Aborigines. Third, the factor that was considered is the human quality in their civilization. . From these three elements (skin, skull, and relationship quality), Cuvier concluded that human origin could be ranked at the next level, with the white race being at the top in terms of appearance and brain capacity. In the middle was the yellow race and the black race at the bottom. This is why polygenesis could be one of the reasons why racism existed in human life..