He was not perfect, for sure. I disagree with his views on the use of the cultic laws of ancient Israel by Christians.
He was a target by those within the Christian community who could not abide the idea that the principles embodied in the Word of God, esp in the moral and civil laws given by Moses could be used as the basis of the legal system in a just society. Reconstruction became a dirty word. It still is for the most part, esp. by those who misunderstand it, willfully or ignorantly.
Well have not read his “Institutes” but have read several Gary North books and found the concepts very interesting.