It looks like you put your lowest attribute (15) in your most important stat (Strength). Why?
"Tanks" are a lie in table top games. Without a disassociated mechanic like 4e's marking or the Antagonist feat, it's entirely reliant on GM fiat.
What you want to do is to be relatively tough, but mostly able to pour out awesome melee damage. If your damage is weak, you're a weak tank, because enemies can safely ignore you. If you're pounding on their guys that try to get by you and generally making yourself appear to be a serious threat, you're doing your job protecting your party.
The feats you need are Power Attack and, uh, yeah, nothing else really matters. Maybe Extend Spell to get your buffs to last longer? Weapon Focus? If you can swing it, get the deity to have a Greatsword, Falchion, or Earthbreaker as a favored weapon (greataxe is an acceptable substitute).
Get buffs with long enough durations to matter--stuff like Shield of Faith is a good low level start--and go to town. Spells you'd have to cast actually in combat (and thus give up a turn of pounding on the enemy for) are not worth taking early on (so don't bother with round/level durations), but will eventually be worth taking when spells totally eclipse melee in the end game.
I think Travel is the strongest domain in the game, hands down. The abilities are just so useful. Destruction and the Growth subdomain both also offer nice benefits to a melee type.
Skills don't matter by mid game. I wouldn't worry too much about them. Int is the 16 I'd recommend switching. And actually, I'd probably go with a 16 in Cha (which drops it to 14--no different than the 15, effectively), the 15 in Int, and a 17 in Str so at 4th level, you can get the 18.
