Sounds good. I've put a list of the feats and powers I've swapped at the top of the sheet, as well as the mechanical changes for each of the feats.
The only other thing I can see there being concern over is the epic cleric feat Supreme Healer. It lets me heal two targets every time I use healing word - not sure if that's super ridiculous for epic level or not, to be honest. However, there is a version of the feat for warlords and for bards, so I guess this just brings clerics up to par on that front.
Anyway, I think I've done enough surgery on Sarenax. I'll leave him alone now

Here's the list of changes:
Powers:
Arc of the Righteous -> Promise of Victory (Reserve Maneuver)
Holy Spark -> Wrath of the Faithful
Feats:
RQ’s Blessing -> Power of Death
* Lose
Raven Queen's blessing channel divinity power
* Gain +2 Religion, +4 damage to bloodied enemies with
righteous brand
Durable -> Death Knell
* -2 healing surges (total = 9 now)
* Gain
death knell channel divinity power
Student of the Sword -> Hero of the Faith
* Lose 1/enc +1 bonus to two-handed weapon attack roll
* Gain
oath of enmity special version
Uncanny Dodge -> Pervasive Light
* Lose uncanny dodge benefit (enemies get no attack bonus for CA)
* Enemies vulnerable to radiant damage take the extra damage when Sarenax hits them with a non-radiant damage power
Robust Defenses -> Supreme Healer
* -2 Fort, Ref, Will (totals = 32, 31, 31 now)
*
Healing word affects two targets