Some fun marginal religions (n < 4) in the SSC survey:

Thelemite
Satanist
Simulationist
Traditional Chinese
Christian (Mennonite)
Jedi
Druidic
Conditional dystheist (the Abrahamic god, if he exists, is the enemy)
Osho
Stoic
Zen
Frequently crippled by utter terror in the face of oblivion
Equestrian
Baha'i

Spiritual agnostic
Norse(Asatro)
Pagan (LARP)
Omnitheistic Goddesses
The God of Baruch could be a good option
Umbanda
Lutheran
I'm not a perfect agnostic--I'm what you could call theist-curious
Non-believing Christian
Mushrooms
Spiritual Panpsychist
12 step
Alcoholics Anonymous

I am curious about whether God exists, though it ultimately has no effect on any of my decisions
Neo American
Free-wheeling syncretist
rave cult recognized by the Man as a 501(c)3 organization
bay area rave cult recognized by the feds
Why use the adjective form for Jews?

Discordian
All/affiliated to none
Vedantist
Non-denominational christian, basically I identify with the religion of western civilization
Asatru
Gnostic Pantheist
Neo-Advaita
It's complicated.
Church of Friendship
Dudeism
Shinto
Animism
Gnostic

I practice Judaism, but don't believe in its theological claims
Culturally Jewish but agnostic…
Not religious Jewish, but traditional
Secular Buddhist
Modern Paganism (witch w/s…
Advaita Vedanta
Messy Thelema
No Religion
I don't believe Buddhism but I draw inspiration

neo-Pyrrhonism
Lesswronger
I am an agent of the divine will and am entirely clueless about what makes up the D.W.
Freedom is the only valid god
Spinozan
Sceptical qabbalist
Agnostic but increasingly leaning towards Protestantism
LOVE
Gods exist but are causally far from humans