The Temple of Ptah
The priests of Ptah are among the most forceful proponents of religion in the Known Spheres. In their gray robes trimmed with scarlet, they are found throughout the Spelljammer universe preaching the superiority of their god.
Symbol: A mummified hand.
Headquarters: The priests of Ptah claim their god created all of the crystal spheres, therefore they have chosen no one spot as a supreme headquarters.
The Path and the Way
Referred to either as a single grouping or by either of its parts, the Path and the Way is a terrestrial gathering of faiths that made the leap full blown into the stars from the Shou empire on Toril in Realmspace. The Path and the Way postulates a celestial bureaucracy, well managed and organized, with various Powers taking on particular duties within the organization rather than venerating any specific deity.
While the Path and the Way has spread throughout the Known Spheres and to many different races, it is fragmented into hundreds of tiny subsects, each proposing specific deities to occupy the various positions within the celestial bureaucracy. Religious scholars disagree (often violently) about the true nature of the Path and the inner nuances of the Way.
Symbol: Followers of the Path use a yin-yang symbol in the colors of the chief of their personal pantheon. Believers in the Way use the sign of a low, rounded stone bridge.
Headquarters: The Path and the Way began centuries in Realmspace. However, it is so fragmented now that any claim of a headquarters would be worthless.
The Celestians are a loosely knit organization of wanderers. Emulating their diety, Celestian of Greyspace, they travel the endless reaches of the stars.
Symbol: Seven Stars of a black circular field.
Headquarters: The wandering clerics of Celestian have little in the way of organization. Their home temple can be found in the Giff Mountains on the world of Oerth in Greyspace.