Necromancy is fine with Christians when their God does it, but evil when other gods do it. The Abrahamic god is the god that conquers all other gods, stealing their power for himself and turning them into his servants. Then the asshole encourages his followers to turn against each other so they have more motivation to keep him central to their lives.
Gods in general aren't really necessary anymore, but they're kind of like meta organisms, quasi living things. They fights back against threats to their own existence, encouraging humanity to remain subservient instead of recognizing our true place as the highest authority.
I'm fine, but my description isn't that far off from how Abrahamic religions took over the globe. People used to have patron gods that they followed or favored, but it wasn't as common to deny the existence of other gods until Christianity popularized it, demanding that only God exists. Other gods were retconned into angels, demons, or saints. Gods often had aspects of reality they controlled, but the Abrahamic God became the master of everything, with all former gods only acting to fulfill God's will. Zeus or Thor were once gods that controlled lightning, but Christians asserted that "It was me, Dio!"
Explicit organizations and informal cultures behave like living organisms at large scales. They evolve, adapt, and reproduce in the minds of people. Humans made ideas as tools for aiding our survival, but the ideas and organizations themselves often use people like tools to ensure their own existence. That's the wild thing about these meta organisms: They don't physically exist in reality, but it's helpful to think of them that way because they're mechanically similar to real lifeforms. The ideas that don't adapt or prove useful die out, while the ones that stay useful or adapt to new environments survive. It was never a marketplace of ideas, but an ecosystem of ideas.