My claim is different because Catholics are Catholics, they aren't Christians. They are not the same. I don't confess to a priest, I don't go by what the pope says. Muslims follow the Koran and do what it says.
Yes, another written authority other than the Bible alone. All the pagan religions of the world have another written source that makes the Bible without effect. They went out from us because they were not of the us. . . . that the Bible describes as new creatures.
Sola scriptura is the reforming authority in any generation. Catholics like the Muslims have another authority (a law of the fathers) as mere commandment of men other than all things written in the law and prophets. The last new prophet was John .
Without their own written law it they would have no followers .catholic have there CCC m Muslim the Quran .Same MO different fleshly fathers.
Catechism of The Catholic Church verse #80 (Thus sayeth the fathers)
80 "Sacred Tradition and Sacred Scripture, then, are bound closely together, and communicate one with the other. For both of them, flowing out from the same divine well-spring, come together in some fashion to form one thing, and move towards the same goal."