It's on p.21 of Faiths & Avatars.
That's what I *thought* I remembered.
I'm kinda surprised at the insistence that clergy = clerics especially given the praise Faith & Avatars still gets to this day.
F&A, as a 2E product, had the 2E superheading of Priest. - which included, Clerics, Druids, Specialty priests but also Mystics, Crusaders, Monks and Shamans.
The clergy though could be any class. I distinctly remember in my own group that when F&A came out, my friends all became "clergy members" and they weren't members of the priest superclass.
One that I can remember was a dwarven fighter who was a high ranking member in Clangeddin's church.
Where did this idea that 2E said that non-priest class members could not be clergy members come from?
Didn't even "On Hallowed Ground" state the same thing?