With that logic you're becoming a Protestant, for how can some aging codger in Rome presume to speak for God 2,000 years after Christ told us to look to the words of God for the answers?
Calvin, unlike the bishop of Rome, based every word he wrote on Scripture. Whatever doctrines he articulated were doctrines he found in the Bible.
And I am free to disagree with any word Calvin wrote if I don't believe it was based on Scripture, because Calvin was just a man and our God-given conscience, renewed by the Holy Spirit, is ultimately what we are to follow.
It just so happens I haven't found any place where Calvin was wrong.
I don’t believe “some aging codger in Rome can speak for God “