Deism is not as popular as theism. The words mean the same thing but they are understood differently. A deist usually refers to a person who may believe in some type of god, deity, or supernatural being. Usually the belief ends there. Deism makes no definite assumption about what the deity is. It may or may not intervene in the world. It may or may not have to do with an afterlife.
I could be called a deist since I know that the existence of something beyond my knowledge is possible. I do not subscribe to ideas traditionally connected with religion such as an afterlife. In this way, I find deism to be irreligious. I think of it as an agnostic theism. It is not a religion by my opinion but others may see it that way.
I see religion as something entirely different from believing in any deity. While I have no motivation to believe in something I cannot see, I also have no reason to stop someone else from doing so. It is only when someone thinks that they are commanded by their god to do something bad to me or someone else that it becomes a problem.
Deism by itself is relevant to me because it allows for separation of a god from a religion. I prefer them to be irrelevant to each other.