Idolatry is the first and chief sin. When a person practices idolatry he has rejected the living God, he trusts in something created, and is subject to eternal damnation.
Matt. 6:24: Ye cannot serve God and mammon.
Jer. 17:5: Cursed be the man that trusteth in man, and maketh flesh his arm, and whose heart departeth from the Lord.
Eph. 5:5: For this know, that no whoremonger, nor unclean person, nor covetous man, who is an idolator, hath any inheritance in the kingdom of Christ and of God.
Philip. 3:19: Whose end is destruction, whose God is their belly, and whose glory is in their shame, who mind earthly things.