He opens with this:
I was reading the blog of a well-respected Christian intellectual who holds a high-visibility post in Christian media. He espoused an idea I hear sometimes which troubles me greatly: that grace means we should be realistic and not expect too much holiness in Christendom as a whole. That is, we should not be surprised when we hear surveys showing that Christians are no different than non-Christians in areas like marriage, sexual sin, and so on.
I hadn't actually heard anyone in Church leadership come out and say that, but that seems to be the trend of the Western church of the 20th century. Rabbi Derek's post is deffinately worth a read.
I could only add, people mistake grace for mercy. Mercy is what's been holding back G-d's hand of judgment on the Western Church for not taking advantage of grace. Grace is there to enable us to become holy. Proper use of mercy is to seek forgiveness when we fail.