The word “pagan” is used in various ways.  There are popular and scholarly definitions.  Here, we get one that makes sense to me from Andrew Sullivan (HT: John Fea’s Blog, The Way of Improvement):

Trump is not an atheist, confident yet humble in the search for a God-free morality. He is not an agnostic, genuinely doubtful as to the meaning of existence but always open to revelation should it arrive. He is not even a wayward Christian, as he sometimes claims to be, beset by doubt and failing to live up to ideals he nonetheless holds. The ideals he holds are, in fact, the antithesis of Christianity — and his life proves it. He is neither religious nor irreligious. He is pre-religious. He is a pagan. He makes much more sense as a character in Game of Thrones, a medieval world bereft of the legacy of Jesus of Nazareth, than as a president of a modern, Western country.

Every pillar of Trump’s essential character is a cardinal sin for Christians: lust, gluttony, greed, envy, anger, and pride. We are all guilty of these, of course, but there is in Trump a centrality to them, a shame-free celebration of them, that is close to unique in the history of the American presidency. I will never understand how more than half of white Catholics could vote for such a man, or how the leadership of the church could be so terribly silent when such a monster stalks the earth.