No, we know all Shedim are evil. If it isn't an inimical to life, consumed by hatred for all things living spirit, it wouldn't be a Shedim at that point. It is sort of their definition. Let's no derail this conversation with the morality of Shedim, though.
As far as 'Christian' Shamans go, I could easily see some Totems being converted to Saints or Angels, for lack of a better term. I even made a aspected magician with the homebrew Guardian Angel Mentor Spirit.