The R in CROSS is for Reason.
The reason Christ died is for sin.
The Bible says, “For Christ also suffered for sins once for all, the righteous [that was Jesus] for the unrighteous [that was us], that He might bring you to God” (1 Peter 3:18).
The Bible, our conscience, and the Law of God (Ten Commandments) reveal that we have fallen short of God’s standard of perfection. From the beginning until today, all people are guilty before God because of their sin.