i know im late to the party but i wanted to give this input....
The unknown secret to an evangelist is not his one domain but what is his alternate channel. I could go on for a long time and spell out how a number of stun locks and debuffs are game breaking but you asked for a support in helping ur group; towards that end Shelyn with luck channel and luck domain is AMAZING. She also is a goddess of protection and has a strong reach weapon prof so she is top tier in every aspect. But i would get ur group to go with the +1 to luck bonuses trait (forget the name) to make em even better.
The protection domain is a good one but loses its luster as the game goes on. The longer the game goes the better other domains get and protection becomes a bit more flat or meh.