8 Bible Verses about Syncretism

The crowds, seeing what Paul had done, shouted in the Lycaonian language, "The gods have come down to us in human form!" They called Barnabas Zeus, and Paul, because he was the principal speaker, Hermes. The priest of the temple of Zeus that stood at the entrance to the town came with crowds of people to the gates, bringing bulls and garlands, meaning to offer sacrifice to them.

While Paul waited for them at Athens, he was exasperated to see how idolatrous the city was. He had discussions at the synagogue with the Jews and those who worshiped with them, and every day in the public square with any whom he happened to find. Some of the Epicurean and Stoic philosophers debated with him. Some of them said, "What is this rag-picker trying to make out?" Others said, "He seems to be preaching some foreign deities." This was because he was telling the good news of Jesus and the resurrection.read more.
So they took him and brought him to the council of the Areopagus and said, "May we know just what this new teaching of yours is? Some of the things you tell us sound strange to us, and we want to know just what they mean." For all Athenians and all visitors there from abroad used to spend all their time telling or listening to something new. Then Paul stood up in the middle of the council and said, "Men of Athens, from every point of view I see that you are extremely religious. For as I was going about and looking at the things you worship, I even found an altar with this inscription: 'To an Unknown God.' So it is what you already worship in ignorance that I am now telling you of.

Some Jews who went from place to place casting out demons tried to use the name of the Lord Jesus in the cases of people who had evil spirits in them, saying, "I command you in the name of Jesus whom Paul preaches!" A Jewish high priest named Sceva had seven sons who were doing this. But the evil spirit answered, "I know Jesus, and I know of Paul, but who are you?"read more.
And the man in whom the evil spirit was sprang at them, and overpowered them all, with such violence that they ran out of the house tattered and bruised.

You must not be carried away with strange varieties of teaching. The true way to steadfastness of heart is through God's mercy, not through scruples about food, which have never done their adherents any good.

You cannot drink the cup of the Lord and the cup of demons. You cannot eat at the table of the Lord and at the table of demons.

but now that you know God, or rather have come to be known by him, how can you turn back to the old, crude notions, so poor and weak, and wish to become slaves to them again? You are observing days, months, seasons, and years!

No one can put you in the wrong by persisting in studied humility and the worship of angels, being absorbed in the visions he has seen, and groundlessly conceited over his mere human mind.

As to eating things, then, that have been offered to idols, we all know that no idol has any real existence, and that there is no God but one. For supposing there are so-called gods in heaven or on earth??nd indeed there are plenty of such gods and lords??6 yet for us there is just one God, the Father, who is the source of all things, and for whom we live, and just one Lord, Jesus Christ, through whom everything was made and through whom we live.