You sound like you want to "role play," yet you're going to meta knowing that Astarion is a vampire despite that he's walking around in the sun and that Shadowheart is a cleric of Shar even though she doesn't tell you that until you've been traveling with her for a while.
Well that the problem as well, maybe if I would have blocked my ears and avoided even looking at anything about the game. I might have been surprised

But the Genie is out of the bottle so to say. I'm still looking forward to the rest of the game as I have no clue to the other acts and that 30% extra in the complete game. 2 more days to wait!
I just hope there are more companions

that would match my Dwarf first play through!
As for Shadowheart, she doesn't act like a servant of shar that true. (At least like the descriptions, from my old 2E and 3.5E guide books says how she is supposed to act

( I the books she would be stripped of her powers I think

)
I'll just enjoy the story and play the vigilant one as best as OP as possible!