There was a study out a few months ago indicating that people think God’s opinion mirrors their own. While they honestly believe they are taking their cue from God, when the person’s opinion changes, they are likely to think God shares their new opinion. (I’d post a link, but my brain is fried… Nicholas Epley did the study, you can Google it if you’re interested.)

Anyway, IMHO that makes God’s will a highly suspect rationale for any course of action.