One point of contention between Catholics and many Protestants is the subject of Tradition. Protestants maintain that the Bible alone (sola scriptura) is the sole rule of faith; neither the authority of the Catholic Church nor the existence of Sacred Tradition should play any role in determining what Christians believe.
What is Truth?
C.S. Lewis put forth this argument: Jesus is either Lord, liar or a lunatic. You must decide. There is no alternative.
If we comply with the corruption of this age, living according to its evil tenets and communicating it to others through our willing adherence to its errors, we might well live more comfortably: we might receive approbation from the powerful and attain to high status among a society gone awry, plagued by moral fragmentation. In the end, however, we will have lost everything that really matters.
St. Augustine’s life provides us with an example of the sublime fruits of grace which Christ bestows upon those who fall in love with the Divine Teacher of Truth. In doing so, Augustine was drawn to the Catholic Church, the holy dwelling place in which the fullness of truth subsists through the ages.
From the Catechism: Christians of the first centuries said, “The world was created for the sake of the Church.” God created the world for the sake of communion with his divine life, a communion brought about by the “convocation” of men in Christ, and this “convocation” is the Church. The Church is the goal of all things.