The last S in CROSS is for Salvation
Because Jesus is our substitute, he is the only one who can offer salvation. Salvation includes forgiveness of sin and the gift of eternal life.
But how is this possible?
To have forgiveness and eternal life you must believe and receive.
the Bible says, "That 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" (Romans 10:9). To confess Jesus as Lord means you turn from sin (repent) and surrender control of your life to Jesus. To believe in your heart that God raised him from the dead means you are trusting in all that Jesus Christ is and has done for you.
Christ by faith is simply trusting Christ alone for salvation. The Bible says, "...To all who received him, to those who believed in his name, he gave the right to become children of God" (John 1:12).