Also, companions don't seem to react to different player backgrounds at all. My character is a Drow cleric of Selûne (unlikely combination, I know), and Shadowheart, who as a cleric of a rival goddess should have hated her on sight, didn't even blink. In fact, the two of them are getting along surprisingly well so far.
I think Shadowheart hides who she worships unless the main character persuades her to confess.
