I started out with no particular beliefs until my parents persuaded me to convert to
Catholicism in order to be eligible to go to parochial schools which they assumed were better than public schools because they were all white. Not knowing any better, I swallowed the whole catechism, hook, line and sinker. In high school one of the brothers encouraged us to debate religious heresies with him, which got me interested in Deism (or pantheism) as he called it. Not long after, I was asked to leave that school, which more or less precipitated a rejection of that religion.
After exploring eastern religions (and reading William James, Max Weber and Emile Durkheim), I came to the conclusion that religion needn’t have anything to do with God, gods, faith or belief. In my experience, the only reason people find the idea of supernatural beings appealing is so that they can enter into a relationship with that being in order to gain an edge over their fellow man. Once one feels blessed by having the True Religion, one eventually comes to believe that one is entitled to act violently toward those not so blessed. So, in this respect, a belief in supernatural beings inevitably becomes a group rationalization for ripping off your fellow man.
The role of gods in Confucianism, Taoism, Shintoism, and Buddhism are tangential at best; so it is possible to have religions that are agnostic or atheistic with respect to the question of God or gods. Indeed, if you see the role of religion as a guide to right living (as opposed to right belief) then religion can become a form of moral discourse and a vehicle for helping people in society develop values, attitudes and behaviors that make life more worth living for the people in it.
In other words, I see no impediment to developing a religion that atheists and agnostics would find appealing, and I am actively exploring that idea.