My reading of the Hellblazer comics is actually quite limited really. I read — and loved — the “Original Sins” collection, and have read odd other instalments. I am, though, better versed than many viewers will be in the backstory.
For many, their primer will be the Keanu Reeves film, which although I quite enjoyed it, is a poor introduction for the comics or anything really based on it. It’s not just that Reeves performance completely differs from the magician of the comics (It might be that Shia LaBeouf is in it… -Ed), but that so many things differ that it is hardly the same thing at all.
One thing, though, it did get right: the sense of heaven above, hell below, and the Earth in between. It’s a battleground, and we’re just the civilians caught in the crossfire.