I tryed on Interlude server and dont work. It is not true that Turn indead is not considered as damage. This skill have few effects - fear, lethal and small damage (in pagan 50-80 dmg to mob, but damage). So once u make Turn undead, u got for example following messages":
You use turn undead
You hit for 78 damage.
Your fear has failed.
Lethal Strike!
So u do damage and the exp is shared as it should be between the chars hitted the mob. I tryed with bishop 75+ and gladi 62+.