Well yes it is. Take for example that Jeremiah had to contend with the Israelites' worship of the Canaanite goddess Astarte/Ashtoreth as the Queen of Heaven. Here was the idea that there was a "Queen of Heaven" whom they could bake little cakes to, and pray to and worship. This myth was a new idea, namely that she had some influence with God and/or was equal to Him. So she would plead their cause. There is nothing like this in Judaism. When asked why they didn't cease their worship, theie answer was "tradition" and "it feels good". And that's just one idea, myth, concept they got from their neighbors
So if you are going to celebrate Christmas on December 25th you are a pagan?