All The Authority Are Belong To Us

So I finished the book Surprised by Truth.  Now I have no idea what to believe.  Is that what they call a crisis of faith?

As I finished up the book the biggest questions that kept rolling around my head were about sola scriptura and authority.  This book prompted me to pick up the Catholic Catechism again.  I turned it on and where would I happen to find myself but in a section about authority.

1897    “Human society can be neither well-ordered nor prosperous unless it has some people invested with legitimate authority to preserve its institutions and to devote themselves as far as is necessary to work and care for the good of all.” By “authority” one means the quality by virtue of which persons or institutions make laws and give orders to men and expect obedience from them.

There is a mix of things in my head so please forgive me for any disorder.

If you interpret the Bible as is so that you eat the body of Christ and drink the blood of Christ, then why does the word “brothers” change to mean “cousins”?

If authority was given to the church (the Catholic church specifically), then how can Protestants claim any authority?

If the Pope is infallible, then why can he state evolution is true which in turn makes the six day creation of the Bible false?

If the church is supposed to be unified, then how can Protestant protest from outside the Catholic church?

We could go back and forth between the evils of the two branches of the Christian faith but what gets us closer to the truth?