This is the first time I've seen the code of conduct do something besides "lose all class abilities." It also makes it better than "my friend casts atone."
Initiate is nice and flavorful. If you have the time, I would suggest creating a different class for the ability, sort of how knights in real life would create squires. Though it definitely isn't necessary.
The bonuses from smite evil are a little high. The bonus to damage rolls is fine, but a +20 to attack rolls is insane. Maybe just int mod or half level?
At will divine form needs a deactivation method.
I was worried when I saw what looked like 9th level spells, but it doesn't look like anything too abusable so I guess it should be fine. Some of the power words make me a little leary though.