They're right, and it is the self-righteous, spiteful behavior of many evangelicals that is fueling it.
Are you referring to something/someone in particular...or just making a hasty generalization?
The article notes the differences in beliefs from Christianity by those practicing a religion they call christianity. It is not dealing with a specific group of people who don't go to church because they have been somehow allegedly offended by some nameless Christian(s).