According to their study 51.5 percent of professors, responding to the question of whether they believe in God, chose the response, "While I have doubts, I feel that I do believe in God," or the statement, "I know God really exists and I have no doubts about it." While atheists and agnostics in the United States make up about 3 and 4.1 percent of the population, respectively, the prevalence of atheism and agnosticism was much higher among professors: 9.8 percent of professors chose the statement, "I don't believe in God," while another 13.1 percent chose, "I don't know whether there is a God." In other words, religious skepticism is much more common among professors than in the general American population. However, the majority are still believers.