You need to first read the great theological works of Augustine, Aquinas, Newman, and Benedict XVI before doing anything else. We all are aware of the anti-Catholic hit sites. This gets you nowhere.
There is one itsy-bitsy point about Protestantism: it goes against 2000 years of rolling tsunami waves of solid historical, theological, and intellectual scholarship by Catholics, non-Catholic Christians, non-Christians, atheists, and agnostics who have no question that Christ founded ONE Church, ONE truth, and this truth emanates from the Catholic Church. This is why it is the infallible nature of Petrine authority that enabled the authenticity of the canonical texts in AD 382. The Church pre-dated the Bible.