Divine Warlock well from what i have read just change the power type..
Eldritch Blast becomes (Celestial,Infernal, or Abyssal) Blast The power to shot your gods power at the enemy. I haven't seen the invocations but they could probably be swapped out for cleric style spells and maybe take away detect magic to give lay on hands/death touch ability
All depends on what god/demon you worship and what energy (positive or negative you wish to channel)
In this setting a divine warlock would be the bridge between the Magic Users and the common folk.