This is where you lose me; there have been multiple editions of D&D where worshipers of a god don't have to have an alignment that matches that of their deity, sometimes wildly so. Yes, in the Forgotten Realms, Umberlee (the goddess of the sea) is Chaotic Evil. But Faiths & Avatars (AD&D 2E) says she accepts worshipers of any alignment, and that her clergy can be Lawful Evil, Neutral Evil, Chaotic Evil, Chaotic Neutral, or True Neutral. In 3E's Faiths and Pantheons, she can have clerics that are CN, CE, or NE. It's not like the game mandates that the gods' worshipers match their alignments exactly.