It is difficult to determine the exact number of people who believe in simulation theory as beliefs and opinions can vary greatly among individuals. However, simulation theory has gained popularity in recent years, especially with the advancements in technology and the increasing interest in virtual reality. Some surveys and polls suggest that a significant portion of the population, ranging from 10% to 50%, may entertain the idea or believe in some form of simulation theory. However, it is important to note that these numbers are estimates and may not accurately represent the actual beliefs of the entire population.