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The ability blessing of the faithful doesnt exist anywhere on the archetype or in any of the cleric class abilities
Ecclesitheurge’s Vow: At 1st level, an ecclesitheurge makes a vow to his deity to be protected solely by his faith, not by armor or shields. An ecclesitheurge who wears prohibited armor or uses a prohibited shield is unable to use his blessing of the faithful ability, use cleric domain powers, or cast cleric spells
This is a typo, they didn't remove that line from the release. That's the answer that's been going around so far at least.