Regardless of your own antipathy toward the Church denying the Church's role in forming the inspiration and providing the incentive and opportunity for the artistic masters of the Renaissance is unfounded.
I say all this because there are artistic masters in every age. But what I don't find is God directing men to paint frescos or ceilings or buildings with pictures supposedly depicting Jesus Christ. Or Peter. Or Paul. Or angels. God has directed and given instructions for two items: The Ark and the Jewish Temple. The rest is man's reaching out to God. The opposite of God's reaching out to man. This world is about God reconciling man to Himself through the finished work of Jesus Christ. Everything else, no matter how "inspiring" or "masterful" takes away from His Word of reconciliation. Meant to please the eye and feed the senses, but void of truth.