A Brief Explanation of the Trinity - Doesn’t the doctrine of the Trinity ultimately come from pagan myths?
The doctrine of the Trinity, if properly understood, is found nowhere in mythology—not even close. Zeus, Poseidon, and Apollo, for instance, and any other trio of gods from around the world do not share all of the same attributes in perfect unity as one God. In fact, Greek myths go out of their way to keep these gods distinct as three gods and beings with their own special attributes. The Trinity has nothing to do with a family or pantheon of squabbling gods or separate divine beings. This is polytheism, and Christians reject it.