Misinterpreted? But do worship him as a god now, or not? If yes, that's exactly what I mean.
As far as Acts of Faith go, the way they were implemented into this RPG they really do not seem that powerful in comparison - it's just a different way of using Fate Points, and most effects benefit the entire group* instead of just the "caster".
*: This actually brings up a question I've not found a definite answer to yet. Should Faith Talents only extend their benefits to characters who at least share the caster's general belief, even if not to the same extreme degree, or should they also apply to "heretics" such as Mechanicus characters or Space Marines as long as they are considered allies? The RAW doesn't distinguish there, but as per the RAW a Sister casting AoE holy fire would hurt even the Emperor Himself if he'd stand next to her ...