One thing that's slightly annoying for me is that since 3e, Githzerai are a remarkable good race for most Divine and Primal classes, due to wisdom bonuses, but most of the background story covering them, doesn't make them out as being the types to want to become things like Clerics and Druids and Shaman. I wouldn't normally consider this important, but players tend to optimize characters and Githzerai + any types of these classes is something that's more optimal.
Well I don't think they were the type to worship deities, though some sources have them favouring the GH deity Zuoken. I'm guessing the fact that the Githyanki seem to blindly follow the Lich Queen sort of discourages Githzerai from following deities.
Though I guess you could say that believing in the Unbroken Circle of Zerthimon, counts as having a 'faith' as far as deities go, taking the path they used with Zhjaeve the Githzerai Cleric from Neverwinter Nights 2. D&D generally hasn't been the best in defining "non-deistic" (I know that this word doesn't really mean what I'm trying to describe) faiths, except for Eberron with things like the Path of Light and Blood of Vol. But I wondering what would the Circle of Zerthimon be in terms of one.
I know it's probably a True Neutral 'religion', thought what domains (or mantles) it gets (in terms of 3e, Pathfinder and 4e) is something I haven't really put much thought into.
And then there's the thing about Githzerai being good at most Primal Classes, to use the 4e term. Never has there been much about Githzerai and their practices with Spirits and nature and such, beyond the whole thing of them Chaos-shaping the plane around them. Though I guess you could say that there's certainly some interaction with spirits when you use your mind to shape the reality around you. You just might feel the spirits when doing that. That might be fine for Shamans though things like Druidic traditions among Githzerai have never been thought of much.
With some exceptions, the gith races are, at best, leery of the divine.
Some of the psionic classes make use of the Wisdom stat. A githzerai who might (as a non-gith) have become a cleric might instead be an ardent, a zerth cenobite, or (3.0) a clairsentient, for example.
My guess would be that a typical githzerai with high Wisdom might be very focused on a philosophy/way of life/form of enlightenment, but would not be eager to engage in active deity worship.
BoGr Guide to Missile Combat:
1) Equip a bow or crossbow.
2) Roll a natural 1 on d20.
3) ?????
4) Profit!