God made man in His own image. He gave man the ability to choose right from wrong. We choose to sin. Our sin keeps us from God. God's Word also says that sin must be paid for For the wages of sin is death.
Wages means payment.
If we go on in our sin, we will die without Christand be without God forever. All of our sin was placed on Christ on the cross. He paid our sin debt for us. But God commendeth His love toward us, in that, while we were yet sinners, Christ died for us. For whosoever shall call upon the name of the Lord shall be saved.