I believe the answer is no, since you're technically still a priest and RP collection has to do with the essence of dead gods inside you.
Conceptually, a fallen paladin would not receive RP from his/her temple holdings, but instead receive RP as a fighter. I don't know if a similar rule goes for a priest that has fallen out of favor with the gods.
OoC: A fallen paladin would generate RP from manors?
No, a fallen paladin would generate RP from the standard paladin range, depending on the rule on temple holdings formulated here.
Ignore what I said about fighter.
