To be a holy priest, you gotta spend more points in that tree than in other ones. However, to be an uber-god priest, you have to push alt + f4 and pull all plugs out of your computer and not put them in again for 15 years. After that period, you will be a god-priest and you can solo everything.
Edit: why do I even bother to correct my spelling for this guy
Edited, Jul 4th 2008 5:52pm by Thundil