In Scientology very little is said about God. However, it believes in God or the existence of deity. It does not necessarily require a theistical personal god, but some kind of deity, Supreme Being or, as Scientology often expresses it, the eighth sphere of influence, or God dynamic.
It should be noted that not all the world’s religions, or even nearly all, believe in a personal God. This is, for instance, the case in a large part of Hinduism. And Theravada Buddhism is in its philosophical form downright atheistic. Despite this, it usually has the status of a major religion.