Sin is rebellion to God. Adam and Eve never had the law yet they entered into sin for all of mankind.
Sin is condition of the heart, judged purely by God and Graham was 100 percent right when he said
James 1:14-16 (KJV)"A sin is any thought or action that falls short of God’s will. God is perfect, and anything we do that falls short of His perfection is sin.
14 But every man is tempted, when he is drawn away of his own lust, and enticed.
15 Then when lust hath conceived, it bringeth forth sin: and sin, when it is finished, bringeth forth death.
16 Do not err, my beloved brethren.