“He [Jesus] was delivered over to death for our sins and was raised to life for our justification.” (Romans 4:25).
Belief in the death and resurrection of Jesus for your sins is essential for salvation, but it is not enough.
“You believe that there is one God. You do well. Even the demons believe--and tremble.” (James 2:19).
You must do more than believe in Jesus. You must confess him as Lord or boss of your life.