I think all of them (and quite a few more from the Codex Alera) are Knights.
Harry Dresden is a Theologically Neutral. He KNOWS that's various Gods exist. Heck, by book 10 he's met the #1 girls of both Fae courts, Odin, several archangels, and a spirit guide or 2. He simply refuses to worship them.
And he is a Knight, through and through. So is Sgt Karen Murphy. There is a reason why he has a Temple DOg looking out for him as well as being the caretaker for 2 of the 3 Swords of the Cross.