Lucky Devil — Cullen Bunn

In the latest graphic novel from the creator of Harrow Couty, a down-on-his-luck schlub is possessed by a malevolent demon.

Just when he thinks things can't get worse, the exorcism goes wrong . . . and he finds that somehow he's retained all of the entity's supernatural gifts. After a path of revenge on all the people that have wronged him, he begins to gather worshippers and form a cult.
 
But the legions of Hell don't take kindly to this, and they send demonic agents to murder the schlub-turned-god before he gains too much power.