Back in 2011, I and the member "Jim" did a survey: Here are the raw results on "Religious belief or background." as they appeared:
No denomination or tradition, loosely Christian but not forced by anyone growing up
Well, I started out as a Hicksite Friend, I've also studies Buddhism, Satanism, and was briefly interested in Wicca
A combo of western hinduism + then agnosticism
Was Wiccan, now Christian
Assemblies of God
Was Lutheran/Protestant, now seeking something true, because I dont feel peace in my heart
C of E
Bible-believing Christian (most likely protestant or evangelical)
"cultural protestant christian"
Belief in people, evidence based events, etc - do NOT have FAITH
Christian Churches/Church of Christ
hippy but not new age
Sunni, Hanafi fiqh, not sure about any differences in aqeedah (creed)
Athiests still believe; they just don't believe things counter to evidence.
Fundamentist Christian, Deist, Atheist
Saved by grace through faith
Buddhism (several types); Asatru; Golden Dawn
nominal Christianity, but never in a serious or exclusive way.
Kiddie christianity. Cured when 11 or 12
vague belief in a 'creator' as a youth