What is a valid Catholic response to this particular claim?
Is the Pope Christ’s vicar on Earth? Can the Pope make new doctrine?
“No. The Bible was complete in the first century, and we are not allowed to add or subtract from it.”
18I warn everyone who hears the words of the prophecy of this book: If anyone adds anything to them, God will add to him the plagues described in this book. 19And if anyone takes words away from this book of prophecy, God will take away from him his share in the tree of life and in the holy city, which are described in this book.
“Therefore, when the Pope does things such as proclaim that Mary was assumed into Heaven, he is directly violating the word of God.”