Sam
Ok, if he hates demons so much, why is he offering to be possession central? Because he realizes that a lot of demons in this world aren't evil right?
And wait, whoa, back up a second, God?!
Lucifer doesn't own shit. You're not going to hell, the universe cannot be that lame. Besides, me and B are both part demon or whatever and we got into heaven when we died.
Or a few other ways- they're pretty vulnerable like that. Get with the slice and dice basically.