The thesis statement or main theme of Romans, if not the entirety of our Christian faith!
Is Christ Working in You? Confession is the obedience to commit ourselves to leading a life that is worthy to be called Christian, as our new life is in Christ.
What is Confession? It is the event of responding to the Gospel's message, then acknowledging our faith publicly. In so doing we are conforming our lives to His Way so our faith applies to our lives.
God wants us to make the fervent attempt to repent, get right with Him, and not lead a double life in trying to serve two contradictory paths in life.