Davis grew up as a Catholic and was an atheist for some of his adult life. After experiencing a self-described "revelation", he proclaimed that he was in direct communication with God and that God commanded him to build a successor to the Second Temple. He committed a decade to creating an OS modeled after the DOS-based interfaces of his youth, first calling it the "J Operating System" and later "LoseThos". In 2013, Davis announced that he had completed the project, now called "TempleOS". It was released to public derision contrasted by mostly favorable reviews from members of the tech community.
Although Davis remained lucid when discussing computer-related subjects, his communication skills were largely affected by his schizophrenia. He was controversial for his regular use of racial epithets, which he explained was his way of combating actors of psychological warfare. During his final months, he struggled with periods of homelessness and incarceration. In 2018, he was struck by a train and died at the age of 48. Investigators could not determine if his death was suicide or accidental.
All info has been gathered from wikipedia as well as the official templeOS website, however I do not know how to properly site sources.