So the Father is God, the Son is God, and the Holy Ghost is God. And yet they are not Three Gods, but One God. … as we are compelled by the Christian verity to acknowledge every Person by Himself to be God and Lord, so are we forbidden by the Catholic Religion to say, there be Three Gods or Three Lords.
The "Athanasian" Creed is heresy. It wasn't written by Athanasius, who actually had a hand in the Nicene Creed. And it contradicts the Nicene Creed, particularly in making the persons so equal there is no point in there being more than one! There is no room for a Father and Son where the two are co-equal and co-eternal, versus the Nicene Creed's "begotten of the Father before all worlds" which shows non-co-eternality.