Feel like I showed up late for the party. Ah well, here's my two cents.
From my pov, Erastil is old and set in his ways. ("This is how things were done in my day. They worked then, and they work now!") He's got a religion that works. You don't exist as long as he does if you're offering something people don't want.
As far as women in his church go (and this is IMHO), I beleive that as long as they are contributing to the greater good of the community, he's going to be pleased, but he might complain on occassion. ("When's the Wilkins girl gonna get married?")
Finally, I agreed with those that have commentted about abusive husbands being 'persuaded' from abusing their wives and kids by being beaten. I would add that clerics have a variety of spells that would be useful in discouraging such cruel behaviour. Also, clerics or Erastil would likely be called on before the marriage to act as councelors. ("Girl, he's no good for you!")
As far Erastil being sexist, yeah he's sexist. He's sexist like your elderly male relative is sexist. The old coot is a jerk, but he wants what's best for you. He's just a little out of step with the times. He's still one hell of a shot with a bow.