Several points:
First, by Word Of Giant, the Twelve are worshipped as a pantheon by Southerners of all alignments.
Second, I imagine that it's very rare for a god to cut off one of their clerics, and even more so when it's an entire pantheon that would presumably have to agree on doing it. (Paladins presumably have more explicit rules for when they Fall).
Third, it's possible that "The High Priest of the Twelve Gods" was the High Priest for Azure City, and that other countries might have their own High Priests.