Quote Originally Posted by Lord Raziere View Post
Well.

figure of faith until he blows up into a second Slaanesh and takes all of Terra with him, except instead of being composed of decadence and pleasure, it'll be of humanity's zealotry, paranoia, hatred and so on. So, y'know the Fall of the Eldar, except worse.
The fact of the matter is, he was going to be worshipped anyway, Lorgar or no Lorgar. This way Chaos won't infiltrate basically every Emperor cult. It might have been better if he'd accepted the religious role and wrote the bloody holy book himself (the entire Imperium pretty much runs off heresy at this point).

Plus it's really not certain what will happen when the Emperor does. For all his psychic might there's nothing definitive that makes him akin to the Ruinous Powers. It's possible he'll become more like the Eldar gods, or potentially just die. We know very little about him beyond 'terrifyingly powerful psyker, probably not actually three metres tall'.