I was thinking about the idea of making champs do a pilgrimage to the opposite light every so often and striking it once with a heavy weapon, to retain their god's favour. I still like this idea but it would make champs targets more than pvpers.
What about if champs need to kill followers of other gods to keep their god powerful among the other gods? A continuous power struggle sounds about right for deities and they could play this out throught their champions. A failure to participate in their gods folly would bring the champ their god's displeasure but an active champion, blessed. In the case where a god becomes less powerful than the others, for example Fo with his followers passive ways, the rewards could be much greater to a Fo champ that helps his god back in the game (who would choose a weak god to champ otherwise). I like this concept and it should meet the objective but it's open to abuse too and would need more consideration than I've given it. Same kingdom killings might be ruled out or carry a stigma for the victim, also giving victims a full pve-death loss of skills might help stop alt killing (allow victims 1 death to a champ without pve skill loss to avoid teh rage), coupled with the killing of high skill players giving more power to the god than low skilled players.
Make of that what you will, it gets champs in the field which is the idea, puts meaning to 'Champion of X god' and would bring even more depth to the intrigues of Wild. Like we need it.