The Catholic church existed LONG before the Bible, as we know it, existed. The ancient scriptures were, indeed, guarded etc. by the Hebrew scribes and the Catholic church faithfully reproduced them in what we now recognize as the Bible....It is foolish to deny history...the Catholic church has existed since the time of Christ...Peter being her first leader. While the name "Catholic" was not used for the first 90-100 years, it nevertheless describes and was the accepted name given to and accepted by the Apostles and their immediate followers....
So then by your claim Catholics are the real messengers, so the catechism that Catholics and Muslims worship the same god is true? Then sir that makes your belief system of Satan since inception.