Protestants can be so stupid.
I'm at best only a Monday-morning theologian (and happy to accept legitimate correction), but they are right about one thing, justification is by faith alone and not by works. But sanctification is also required for salvation (that "pure heart" beatific thing), and sanctification takes work. Any old dog can return to its vomit, even after being justified.
I actually had a very-well educated and very "Bible-savvy" Prot tell me that they thought I was "splitting hairs" by differentiating between justification and sanctification. Maybe I should've given her a dictionary for Christmas.
"Then said Jesus unto his disciples, If any man will come after me, let him deny himself, and take up his cross, and follow me." (So, taking up one's cross isn't work?)
"For the Son of man shall come in the glory of his Father with his angels; and then he shall reward every man according to his works." (And since our Lord said "every", I take that to mean both the saved and the damned, without regard to whether they were ever justified in the waters of Baptism.)

Interesting that Wilson includes C.S. Lewis as a Catholic, he was afterall an Anglo-Catholic albeit he rejected Papal Supremacy. Maybe someone should tell Wilson that Catholics do believe that salvation is through Faith by Grace, but also by works. It's not either or, but both and. A Faith without works is a dead Faith.