1 John 1:9 (ESV)
If we confess our sins, he is faithful and just to forgive us our sins and to cleanse us from all unrighteousness.
The word sin is recorded almost 1300 times in the King James Bible. The amount of attention stresses the importance God places on sin.
The English word translated as sin in the Bible is derived from several Greek words and has various applications. Among those are, trespassing, rebellion, and missing the mark (failure to meet required standards) are the ones most often rendered as sin. But the bottom line of all these definitions is they separate us from God.
Romans 3:23 tells us that sin causes all of us to fall short. The devil knows this so, one of his strategies is to make people void of moral conscience. When this happens, we have a tendency to take sins too lightly, or worse yet, fail to recognize or acknowledge sin as sin.
God has always provided a way for His people to deal with their sins in order to maintain fellowship with mankind. In the Old Testament, God dealt with sin through animal sacrifice. In the New Testament, God deals with sin through confession. According to Romans 10:9, confession erases our sins, and in God’s Word for today, in 1st John 1:9, confession cleanses us from sin.
The Old Testament sacrifice of animals' blood was a foreshadow of the blood of Jesus in the New Testament. The first was because of the Law, the second is because of Grace. We should be thankful that God loves us so much, that He provided a way for us to enter into His presence and have Holy fellowship with Him.