1 Corinthians 8:4
Now concerning [the matter of] eating foods [once] offered as sacrifices to idols, we know that an idol is [really] nothing in the world [at all], and that there is only one God.
1 Corinthians 10:19-20
So, what am I saying? That an animal sacrificed to idols is [really] anything, or that an idol [itself] is anything?
1 Timothy 4:1
Now the Holy Spirit specifically says that in later times [Note: "Later times" in the New Testament usually refers to the period following the first coming of Christ and the establishment of the church], some people will fall away from the faith [i.e., the true teaching of Christianity]. They will pay attention to deceitful spirits [i.e., lying people] and the teaching of evil spirits.
Revelation 9:20
And the rest of mankind, who were not killed by these plagues, [still] did not repent of what they had made with their hands [i.e., their idolatry]. They did not stop worshiping demons, and gold, silver, brass, stone and wooden idols, which can neither see, nor hear nor walk.