Hi, JohnnnyRush. Welcome to UM.
I am unsure what you mean by "completely made up by the church," but you are correct that Catholic teaching is not based solely on the Bible.
Sola scriptura is a Protestant concept, not a Catholic one.
The institutional church presents itself as the current generation of an unbroken line of clergy stretching back to the disciples of Jesus, as do the Orthodox churches. In both, the relgious authority of living clergy derives from this "apostolic succession."
Catholics, but not Orthodox, also believe that God himself, in the person of the Holy Spirit, provides direct personal guidance to the Pope on matters of faith and morals, and ensures his accuracy in those domains.
There are some ritual niceties which cover outright gaffes like Gregory the Great's error about Mary Magdalene's profession, and the various times in history when it was anybody's guess who, among rival claimants, actually was
the Pope.
Much of the time, the Pope would be relying on what is called
tradition. I am unsure that Sepet Dalv meant the same thing as Catholic apologists do when he used the word in his post.
In any case,
tradition is supposed to be additional information about religious matters beyond what is in the New Testament, including interpretations of difficult passages therein, that were believed by early Christians and transmitted forward through time by the institution of the church.
The doctrine of tradition is obviously the antithesis of
sola scriptura. However, many of the sources of tradition are written down, in the works of early Christian bishops and others.
In addition, the Pope can make binding pronouncements about matters of faith and morals that exceed tradition. For example, he can declare that some recently deceased people are in Heaven, the modern saints.
Some matters that might have been discussed in the early church seem to have been made binding only recently, such as the immaculate conception of Mary, Jesus' mother (1854).
http://www.newadvent.org/cathen/07674d.htmThe case is interesting because written tradition is at least somewhat divided on the point, and Pope Pius IX exercised his authority to asssert the doctrine despite that.
All of the foregoing is offered as an explanation of what the Catholic position is. I am reporting the belief, not advocating it.