You need some anti enchantment in this. Nevermore would really mess up the nice bouncing you have going with Stonehorn. I would suggest Revoke Existence.
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Also, I personally would swap out the Shieldmates Bessing for faiths Shield. The downside is that you loose the damage protection factor to yourself, the upside is it can stave off some of the nsatier burn spells, and let some of your creatures / enchantments through a board wipe. Not to mention it will work against cards that give -1/-1 counters, such as black suns zenith
Oh, and whispersilk cloak.
This deck requires Stoneforge Mystic, and Puresteel Paladin. They will make you quite a but more Versatile.
I would still Maindeck the faiths shield. They can really save your ass from a Day of Judgement, Creeping Corrosion, Revoke Existence, and other such nastiness. Playing against another control deck, the arrest / Forced worship might be a bit of a waste. I personally would sideboard 1 arrest and 2 forced worship, and MD 3 of the faiths shield. Just gives you a more well rounded first game, with the option of customizing based on what your opponent is using.
Good call with forced worship. I forgot about that card. I guess fiend hunter is personal preferance. Possibly sideboard it, so after the first round, when your opponent has MD'd enchantment removal and subbed out creature removal, you can give them an unpleasant surprise. Nevermore would work well on the sideboard as well, IMO
Why Arid Mesa if you have no Mountains? Also, IMO, it makes sense to drop the Sun Titans in favor of two more Sky Ruins. The titans ability only works on creatures with mana cost 3 or less, which rules out some of your best cards. It costs 6 to cast, so more than likely you will not be using it until turn 6 at least. Oh, and if you can find a spot for it, more coat of arms. That card is unbelievably overpowered, and if you have more than one, you are fairly unstoppable (minus board sweepers).
Personally, I would sideboard 1 arrest and 2 pacifism, and Main-deck 3 Faith's shield. Most decks run Anti Enchantment / Anti Artifact, so side-boarding it just costs you a game, when you will most likely swap it in anyways. An alternative to Oblivion ring is Fiend Hunter. Almost the same effect, and almost the same mana cost, this at least gives you a chump blocker at your disposal as well. It would work good when an opponent does not have creature removal. Just my 2 cents.