1. There is no holy resistance in game, it is static the only thing that will reduce its damage is an ability that reduces damage taken via divine protection, shield wall, ice bound fortitude etc.
2. While it doesn't say +(insert given number here) it will still have this via mastery, right now my mastery increases tv damage by 36% this will also apply to Final Verdict (Conviction talent)
3. Inquisition increases holy damage done by 30% so for TV that 638 is holy damage so inq increases that around 212 making it hit for 750 extra holy damage. Ex. Lets take my 92k TV crit in pvp (real number) for example and make that lets say 85k crit multiply that by .3 (30%) you get 25.5k add the two together and you get 110, 500 Final Verdict damage instead of 92k.
And these are just random numbers, however even after the nerf to the initial number you can tell it is a considerably large dps increase.
I also need to add that I didn't factor in any armor values either as the 92k crit TV is reduced by armor stats as well. So the number above for FV is probably 5 to 10k higher now that it does pure magic damage.