Confession is a true and accurate statement about self. If we confess Jesus as Lord, then we are admitting that Jesus has authority and the right to rule over our life. It also means we should be willing to live with His will over ours.
Believing in your heart that God raise Jesus from the dead is essential. If you believe God raised Jesus from the dead, then you must first believe that Jesus died for your sins.
If we confess Jesus’ authority over our life and believe in his atonement and resurrection (victory over sin and death), then we will be saved.