Sorry, you are wrong.
I am no Bible thumber nor do I want to start a theologic discourse here, let the monks in CK2 do that, but don't you remember that scene when the devil is tempting Jesus by taking him up a mountain and presenting him all the scenery around and promising him he would give him power over all this if he worshipped him (the devil)? This is where the belief is based upon that earthly things are under power of evil.
Matthew 1;12-13 and Luke 4;1-13 the third of four seduction attempts mentioned. << Once more the devil took him to a very high mountain and showed him all the kingdoms of the world, along with their splendor.
9He told Jesus,
j “I will give you all these things if you will bow down and worship me!” Then Jesus told him, “Go away,
k Satan! Because it is written, ‘You must worship the Lord your God and serve only him.’” So the devil left him, and angels came and began ministering to him.>>
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The other separation of spirituality (good side) and all the rest is seen in the other scene, where Jesus talks about money (Luke 20:25): <<And he said unto them, Render therefore unto Caesar the things which be Caesar's, and unto God the things which be God's.>>
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As these are Bible quotes, it is impossible to interpret them as 'heretic'.
By the way, I find this picture ('Temptation of Christ' by Juan de Flandes, 1460-1519) funny because the devil while tempting Jesus is dressed like a monk (!):