It's really that simple!

⁸Salvation that comes from trusting Christ--which is the message we preach--is already within easy reach. In fact, the Scriptures say, "The message is close at hand; it is on your lips and in your heart."

⁹For if you confess with your mouth that Jesus is Lord and believe in your heart that God raised him from the dead, you will be saved. ¹⁰For it is by believing in your heart that you are made right with God, and it is by confessing with your mouth that you are saved. ¹¹As the Scriptures tell us, "Anyone who believes in him will not be disappointed." ¹²Jew and Gentile are the same in this respect. They all have the same Lord, who generously gives his riches to all who ask for them. ¹³For "Anyone who calls on the name of the Lord will be saved."
(Romans 10:8-13)