Why should we confess our sins to fellow Christians, being painfully transparent about what is really going on in our hearts? In addition to the fact that God commands it (James 5:16)...

It invites personal accountability

It helps us feel how foolish and dark our sin is

It makes war on hypocrisy

It brings a sense of liberation and a burden lifted

It lets others know how to specifically pray for us

It keeps us honest

It draws us close to fellow believers

It lets other believers know that it's safe to be transparent too