We know that “an idol has no real existence” (1 Corinthians 8:4). Paul, while addressing an immediate problem related to Christian liberty, simultaneously addresses a vital overarching point regarding idolatry. Idols are nothing; they are not just false gods, they are no gods at all. Of course the material, physical stuff from which the idol is made is real, but the god it represents does not exist. There is no need to fear idol gods, and there is certainly no reason to worship them.
Exegesis
The Faith of Abel & the False Religion of Cain
In the course of time Cain brought to the Lord an offering of the fruit of the ground, and Abel also brought of the firstborn of his flock and of their fat portions. And the Lord had regard for Abel and his offering, but for Cain and his offering he had no regard. So Cain was very angry, and his face fell (Genesis 4:3-5). Just one chapter after the fall, and just one generation from Adam and Eve, we already see the beginning of false religion. And we see how dangerous, self-deceptive, and disappointing it is! Acceptable Worship Notice this:
Christ-Centered Parenting
He established a testimony in Jacob and appointed a law in Israel, which he commanded our fathers to teach to their children, that the next generation might know them, the children yet unborn, and arise and tell them to their children, so that they should set their hope in God and not forget the works of God, but keep his commandments (Psalm 78:5-7).