I John 9

I John 1:9:
  If we confess our sins, he is faithful and just and will forgive us our sins and purify us from all unrighteousness. 

“His promise to forgive if we confess….admit that we have sinned. The word for confess is homologeo, which literally means to “speak the same.” Confession is calling it what God calls it. If God calls it sin, we don’t get to call it a mistake. If God calls it sin, then we must call it sin as well.