"....And being an enemy to the scriptures of God, wishing to deceive men, he says that there is to be space of a thousand years for marriage festivities." "One of the doctrines he taught was, that Christ would have an earthly kingdom."
The idea that the Millennium is for physical pleasure is a Gnostic idea. That is the heresy, not the idea of a Millennium itself. The idea of a Millennium is found in Scripture in Revelation 20. The idea of it being for physical pleasure is explicitly against Scripture. That, not the Millennium itself, is the heresy.
:)