What a huge warning sign! In my experience, Christians who complain that fellow Christians put too much emphasis on grace are precisely the type of Christians your book would have been warning about.

So, what is Christianity? To the a-hole variety, it's lists of sins, enforcement of received morality, and consequent social control. Luther and Calvin both come to mind if we want to go back a few centuries. Jerry Falwell comes to mind more recently. To them, grace is filled with (or constrained by) loopholes that limit God. To them, grace is a suspect doctrine that often leads Christians astray, no matter that the Jesus of the New Testament emphasized it above all else. (Love God and love your neighbor even when your neighbor is a Samaritan or a Roman ... those are pretty difficult commands to twist or misunderstand, but conservative Christians sure give it the ole college try.)

I'm remembering a friend of mine whose conservative Christian father wrote a whole book about how Christians are misled by doctrines of grace and need to de-emphasize the importance of grace. I sat around a campfire debating that with him one Fourth of July as the kids were launching floating lanterns.

I think he would fit neatly into the definition in your book title.