I was forgiven after 10 or so prayers. Which is also close to number of avatars I killed. Maybe I was getting bonus for killing things, which is this Deity's favorable activity.
Speaking of killing avatars, is there a way to do it faster? With bunch of defensive sustains AND quad beacon bonuses AND Thaumcraftt shielding I can tank Avatar pretty good, but damaging it is very slow. ~6 hp per strike with 20 damage weapon and Strength II.
EDIT: And no, Doom Bolts are not effective either.
Avatars can kill other avatars pretty effectivly. Expecially if it's a warrior type.