Champion of the parish is a good card. It might even be okay in this deck, however, if you're not playing Naya (Red, green, white) then you're not able to get the full potential from the champ. The synergy he has with burning tree emissary and any other 2 drops is too great. In that deck he can easily be a 5/5 on turn 3 swinging for game. These colors are not capable of that.
The problem with the WB you're building there is exalted doesn't trade well on the defensive side so you're weak to the agro decks and midrange decks will just remove your creatures and block in their favor. if you really want a flyer on turn 3, then gift of orzhov is fine and it helps with the life gain issue you're facing, but still presents a 2 for one opportunity for your opponent.
Zombies can pull off the strategy you're trying as well. Green still inst necessary for the cards you're putting in. IMO Rancor is not enough reason to diversify your manabase so much. BW zombies is a tournament winner too. http://sales.starcitygames.com//deckdat
ckID=53092
Gravecrawler
Geralf's messenger
blood artist
Blood throne vampire
Diregraf Ghoul
You can sac zombies to blood throne vampire or something else. with a blood artist out. Blood throne can get pretty big and she can finish someone pretty quick. The deck is all about the synergies between the resilient zombies and the sac effects. Besides what's more unholy than zombies?
Alternately , If you're set on the WBG and want a creature based WBG there are other options that would work better. You could start trading for the aristocrats deck that just won SCG. it's resilient and powerful. It's similar to the token strategy I posted about earlier. Sublime can still work in it since voice is expensive, however, voice is important to the deck.
http://admin.starcitygames.com//deckdat
ckID=56296
If you want to stay with the current exalted strat then consider this.
Cards to consider removing:
All the green - Nothing you're getting here you can't get some where else in WB.
The Knights - if they're alone it's a vanilla 2/1 for 2, which isn't good. If they're out together, and attacking then it's a 3/2 for 4? The protection can be relevant, but probably not enough that the deck would miss it, for 5 mana, you can cast blood baron that has protection from both, lifelink and is a 4/4... besides the plan is to cast sublime and finish the game right? You don't need extra exalted cards that can be easily removed. Also can't be enchanted by anything white or black depending.
Undying Evil - there are creatures with undying that are far better, and gravecrawler is soooo much better.
Cards to consider adding:
Precinct captain - 2/2 first strike for 2 that can create tokens tokens. With an gift of orzhov on turn 3 he can gain you 4 life and put a soldier in play. Turn 4 with sublime on the board he could swing for 6.
More lingering souls - tokens are good with sublime and this one has pretty good value.
Gift of orzhov - it does create the bad 2 for one scenarios but it provides evasion and life link.
Sorin lord of innistrad - creates tokens. give screatures +1/+0....
Vault of the Archangel - it can make all the tokens death touch which can scare your opponent.
Boros Reckoner - Cost triple white in this deck, but he's a solid card, can redirect damage, and can really protect your board.
Removal - tribute to hunger, devour flesh, murder, orzhov charm, o-ring, tragic slip, ultimate price
Rootborn defenses - this + vault do the same thing as ready//willing almost and it gets you out of green, you can cast rootborn more reliably than you can cast ready and this will populate if you have any tokens on the board.