First, influenced by the living conditions and environment at that time. Newton was born in Lincolnshire, England. Christianity is very popular in Britain, and Newton's growth was greatly influenced by religion. Newton's scientific research was carried out with the support of the church. Newton himself said many times when he talked about science that he was instructed by God to study science. At that time, the social pressure on atheism was enormous, and basically all those who openly did not believe in God were dead. So, in that background, Newton was more addicted to religion.
Secondly, Newton lived a luxurious life in his later years, divorced from science. Newton made great contributions to mathematics and physics in the first half of his life, but in the second half of his life, he was made a nobleman by the British royal family, and his status rose again and again, basically not touching the scientific field. He even devoted himself to theology, wrote an exclusive study of10.5 million words, and also studied alchemy.
Third, the mind of genius gave Newton rebellious psychology. Although Newton believed in religion, in his later years, Newton became obsessed with religion, especially intelligent scientists like Newton, who studied basic problems and were naturally more interested in larger-scale academic research. At that time, theology and science were mentioned side by side. In that context, he naturally focused on profound theology.
Newton studied alchemy at that time, and he was quite accomplished in chemistry. It was just a fire that left all his research with only a few pages of chemical drawings. I believe that without this fire, Newton would have made a contribution to chemistry.
Whether addicted to religion or alchemy, for Newton, the process of research is his whole, and these stains can't hide his contribution to human society.