For anyone truly role-playing a good-aligned PC ...
Characters who are a vampire or a Sharan priestess are indisputably evil. There is no possible counterargument. You can try to spin these two characters this way or that, but you cannot escape the fact that they are evil. In the Forgotten Realms setting, there is no such things as a "good" vampire spawn or a "good" priestess of Shar.
Quite the contrary, WoTC is purposefully moving away from identifying any faction/race/class as indisputably good or evil.
That's why they pressed Larian about not making alignment a thing in the game, to begin with.