I suppose it would require True Believer.
As for the Enlarge Spell, it could be an interesting ability, as it just lets you cast spells from a longer distance... which is an issue if the AI is unable to see the caster due to distance. Hence you could just spam AoE, and the mob goes down on its own.
Sacred Defense is largely irrelevant.
Alignment Focus would not do anything beyond few 'Evil' spells as far as I know. It is potentially +1 spell DCs with them though.
The bonus feat is a nice addition and removes the cost of PRC requirements.
And then there is the Divine Shroud, which lasts 15+ rounds on any DC based sorcerer, which is a lot considering all their other defensive buffs. So this would be a PvP PRC for sorcerers.
Another interesting arcane prc is
Enlightened Fist, which is basically mixture of current Bladesinger and Sacred Fist for arcane casters.
