In your capacity as a necromancer, you're surely religious. What belief do you subscribe to?
Honestly? In all honesty, veneration of the dead and ancestor worship. Not a put on as the necromancer affectation, but as a serious real world belief.
I believe there is a god or gods, but I want nothing to do with such beings. I believe they are undeserving of my attention and so give thanks to those who have actually had an impact on my life and existence. My ancestors and deceased relatives. I celebrate halloween as a religious holiday of reflection and set aside the death dates of my direct family as occasions of importance. Other than that, "worship" is carried out simply by remembering them daily and not doing anything you wouldn't want them knowing about between midnight and 3AM.