What does it mean to BELIEVE?

BELIEVE that Jesus died to pay for your sins, that He rose again, and is alive today.
"For it is by grace that you have been saved, through faith – and this is not from yourselves, it is the gift of God." Ephesians 2:8

"Salvation is found in no one else, for there is no other name under heaven given to men by which we must be saved." Acts 4:12

Faith is not just believing facts about Jesus.

"You believe that there is one God. Good! Even the
demons believe that – and shudder." James 2:19