In the Realms, would a cleric of the entire Faerûnian pantheon make sense, or would the gods deem that they were spreading themselves too thin? How would other clerics react to someone like that? Most deities, and other clerics, would regard such an individual as insane (the mind can't devote itself to so many gods, and hold and keep straight so many creeds, at once…and as many of the gods have conflicting aims and ethos, the person would be endlessly tortured by…
— Ed Greenwood (@TheEdVerse) August 8, 2018
"which way?" decisions, and possibly go catatonic as a result. Clerics can handle friendliness to ALLIED gods (e.g. the Triad), and even cooperate on the use of worship space in an all-faiths temple (e.g. the Plinth in Waterdeep) but serving all masters just doesn't work. Sorry!
— Ed Greenwood (@TheEdVerse) August 8, 2018