""For there is no condemnation for those who are in Christ."
Confession is quite simple. It is correctly stating what happened or what is.
For a doctor to be able to correctly diagnos someone, he needs to know that facts as they truly are. He needs to know the family health history. He needs to know any injuries or illnesses the patient has had. As the patient (hopefully) accurately and fully shares with the doctor past and present conditions, he is, in a large sense, confessing. There is no condemnation from the doctor of anything that the patient shares. This information is needed for the doctor to accurately prescribe medicines or forms of treatment.
True and full confession is most helpful when it is done to knowledgeable person or a trained professional. They know what information is needed and ...
However, confession given to an immature or person of little knowledge is really just waisted effort.
Many people are so resistent to the idea of true and deep confession that most won't be real. At most, they might "confess" by saying something like "I sinned" with little or no details. Consequently there is little or no true release or forgiveness. So many people want to be forgiven, but they are willing to say what that want to be forgiven of.
The Purpose of Confession