"If the Bible is a Catholic book, why is auricular confession, indulgences, prayers to the saints, adoration of Mary, veneration of relics and images, and many other rites and ceremonies of the Catholic Church, left out of it?"
St. Matthew 23:5-7: "And all their works they do for to be seen of men. For they make their phylacteries broad, and enlarge their fringes. And they love the first places at feasts, and the first chairs in the synagogues, And salutations in the market place, and to be called by men, Rabbi."
The above passage has nothing to do with clerical dress, but rather it condemns the pride of the Pharisees who would use their office as a means of seeking their own glory.
"Why does it teach against the adoration of Mary? (Luke 11:27-28)"
St. Luke 11:27-28: "And it came to pass, as he spoke these things, a certain woman from the crowd, lifting up her voice, said to him: Blessed is the womb that bore thee, and the paps that gave thee suck. But he said: Yea rather, blessed are they who hear the word of God, and keep it."
Instrumental Music in Worship
Psalm 150:4: " Praise him with timbrel and choir: praise him with strings and organs."
Indulgences (see again the article on Purgatory)
Confession to a Priest