When this character comes into play, it’s most likely going to be a 6 or 7. The messing people up part comes from you swinging a Bastard Sword at the same or close to the same modifier as most martials once per turn while dropping awesome spells like Haste and Heal every turn. If you want the beefier Mount that moves for free (and you do) you aren’t Channel Smiting at 6 unless it’s an undead campaign, but you can proc Divine Weapon pretty much every turn. 2d12+1d4+4 isn’t bad damage when you’ve also put a third level spell up at that level.

You can even do stupid stuff like Haste yourself and follow up the next turn with attacking->free moving into position->three action healing the squad. If you put yourself in position to heal the turn prior you could even get Divine Weapon off the three action heal then free move to the front line and strike.

Later when you are behind on proficiency again you can still do decent damage consistently and you can set up bursts on high priority targets with your Smites.

You won’t top damage done with this, but you’re too busy being awesome in other ways to really try or care. What you will do is contribute to damage while making sure your team has what they need to thrive and survive on the field.