What is Catholicism?

The Roman Catholic Church presents itself as the one true Church established by Jesus, and claims that Peter was set up as the supreme Apostle upon whom that Church was built. The current leader of the Catholic Church, called the Pope, is allegedly Peter's successor, and is therefore the "visible head" of the Catholic Church. In a sense, though Catholics usually object to this, the Catholic Church is the Christian equivalent of the Pharisaical sect of Jews that existed in Jesus' day, giving lip service to Scripture, and in many cases being quite devout, but placing such a heavy emphasis on man made tradition that Scripture is often disregarded. In Catholicism, those traditions often came from the Roman paganism that surrounded the Catholic Church in its infant stages.
 

What is Protestantism?

Protestantism is a term given to a wide range of Christian traditions that are separate from the Catholic Church. Occasionally, the term is applied to Orthodoxy, but it is typically applied to Churches that affirm principles described during the Reformation, particularly the 5 Solas: Sola Scriptura, Sola Christus, Sola Gratia, Sola Fide, and Sola Deo Gloria. Although Bible Brain is technically a "Protestant" ministry, we reject the term, simply because a Church should be defined by what it affirms, not what it denies. We don't call ourselves atheists for rejecting Allah, and there is no name for rejecting any other Church. We therefore feel the term "Protestant" gives Catholicism far more credibility than it deserves, whereas the Bible, and therefore the doctrines preached within it, have existed since before there was ever a Catholic Church to protest. For this reason, while we are technically a "Protestant" ministry, we reject the term, and use it (in air quotes) only because it is the common vernacular.

Due to both its importance to the Christian faith, and the large number of denominations rejecting it, Sola Scriptura has its own section on this site.