Unless you're happy playing a healbot, divine classes have little to offer in the new system. Evocation DCs are mediocre for Implosion, and kiting 10k HP trashmobs through 450 point Blade Barriers is a snoozefest.
Meleeing as a divine is a dangerous proposition compared to good melee builds. Your only paths for damage avoidance are Incorporeality or Dodge:
* While 6 Monk/Ninja Spy provides 25% Incorporeality while centered, your casting ability is significant reduced due to fewer divine levels.
Dodge is great damage avoidance, but maxing it out just isn't possible without being centered and 6 Monk levels:
03% Acrobatic (assumes 2 levels of Monk for feats; centered)
02% Monk level 2
03% Dodge feat (assume this is a Martial bonus feat)
02% Mobility (assume this is a Martial bonus feat)
01% Haste spell
04% delta if 6 levels of Monk available
25% Dodge (cap)
Without Monk levels, you're looking at 11% Dodge.
* If you go Monk for damage avoidance, then your damage mitigation is nerfed. Full BAB (28 with Divine Power) provides 22.6 PRR with medium armor. Centered Monk Master Earth stance is 12 PRR and costs you a feat.
If Warpriest needs anything, it's some amount of Incorporeality (divine/angelic form?) and/or Dodge without relying on being centered with 6 levels of Monk.