Buddhism is sometimes called nontheistic. Seems to hold for Quakers, too (link).
 Quote:
By nontheistic Quakers, I mean those Friends, members and attenders, whose religious perspective depends minimally on the supernatural. Several recent surveys have shown that many who might variously be described as Nontheists, Agnostics, Religious Humanists, Non-Realists, Atheists, and/or Post-Christians have been attracted to Quakerism in Britain, and there is ample anecdotal evidence of the same trend in unprogrammed Meetings in North America.
I usually put down adogmatic nontheist or secular humanist when asked for my religion, though lately I've been considering myself at some unnamed location between nontheism and transtheism.

Ceci n'est pas un seing.