1 Corinthians 5: Freedom misunderstood

The church of Corinth misunderstood what is grace. A man was having sex with his step mother, sin even to outsiders of the church; however, the church was proud to be inclusive. Paul see the church as arrogant, as boasting about being inclusive when in fact they were not helping the man to be free of his sin. Paul says that the church should expel the man so that he understand his sinner condition and repent.
The Christian church in general doesn't deal with sin very well because the church hardly confronts sin.