I'll assume you are talking about Frank Herbert and his works. Dune is one of his best-known books, and says a great deal about Herbert's thoughts on the nature of religion. Through a selective breeding process, some of the characters in Dune(the Bene Gesserit women) are trying to create a male that has the same power they do--to be able to change a drug that enables them to have memories that are not just their own, but of their ancestors as well. They are in effect creating their own god; Herbert is, I believe, saying that this is what happens in general. People create gods, rather than the other way around.