[sadga]

> the idea of creating a new church that would take everything all the other religions said you could not do and made it OK.

detailed in Heinlein's Stranger in a Strange Land

Also, Unitarian Universalism (a religion formed because Unitarianism and Universalism weren't broad enough!) is basically the most dilute religion. They have churches and services and community activities but no liturgy beyond a vague spirituality.