Alright then, Bishop Porteus. Let's assume your logic is correct even though it's not, and go straight to the side point that's more important to you.
How about refusing classification for The Bible?
After all, it has virtually every kind of mature content in it somewhere, not to mention physical threats directed at all those not agreeing with its message.
You can't argue that literature doesn't incite violence, either. You think The Communist Manifesto didn't lead to any conflicts? Since this is mostly about fictional works, how about the harm done by the other religious works that are studied by other religions (works which you mostly believe to be fictional)?
How about we just ban everything mature? After all, that would be fair. But then we'd have to wonder what would happen in a world where people don't know that jumping off a cliff onto sharp rocks will kill you, getting shot doesn't kill you, and having rampant unprotected sex is going to give you AIDS or an unwanted baby.
To me, those results don't seem any more pretty than whatever psychological effects the experience of fictional violence and sex might have on watchers, readers or even gamers. On the contrary, the psychological effects of harsh media are dwarfed by the significance of real world ignorance.
You want your violent text to be sold for its message of salvation? Then I suggest that, because I want my BioShock games to be sold since they criticise the selfish Ayn Rand, on the matter of games, you take that hat of yours and stick it in your mouth. An R18+ rating is fair because that's what every other medium gets. To say anything less is merely to support the blocking of content you don't agree with or like. You know what that's called? Fascism.
Take yours somewhere else.
