Robert Greene, the author of books like The 48 Laws of Power and The Art of Seduction, has not publicly disclosed his personal beliefs about God. His works primarily focus on power dynamics, human behavior, and strategy, rather than religious or spiritual matters. Therefore, it is difficult to determine his personal stance on the existence of God based on his published works.
Greene’s writings often draw from historical examples, philosophical ideas, and psychological insights, but they do not delve into theological discussions. If you are interested in understanding his views on religion or spirituality, you would likely need to look for interviews or personal statements where he might address these topics directly.