JW are all or nothing, but lots of other religious communities accept various degrees of unbelief: various Jewish denominations, Quakers, Unitarians, Episcopalians, Western-style Buddhists, etc. Catholicism is officially all or nothing but if you're born into it, there are a lot of liberal parishes where you're not expected to actually believe it. There was an Episcopalian meme circulating in the 00s where it showed a picture of the controversial liberalizing American Archbishop with the text "Don't believe in that crap? Neither do we."[1] That's pretty standard among mainline denominations.

[1]: http://mliccione.blogspot.com/2006/11/apropos-of-episcopal-p...