"Sacred tradition" is merely a man-made artifice not deserving of our attention. The Bible is "man-made". It didn't drop out of the sky.
Men wrote it, men compiled it and men canonized it.
Men did indeed write, compile, and canonize the Bible, but they did so
under the inspiration of the Holy Spirit ("
All Scripture is God-breathed and is useful for teaching, rebuking, correcting and training in righteousness, so that the man of God may be thoroughly equipped for every good work. " 2 Tim. 3:16-17).
All "sacred tradition" is not so divinely-inspired and is therefore to some extent unreliable. The Bible is completely reliable.