I used to think so also. "Bible Only" was my mantra. "Just the scripture" for me, it was.
However, I decided that I needed to truly KNOW what the truth of the Church that Christ established was, so I did my research. I could go on and on (and would, if you are serious about knowing what I found), but suffice it to say that there is no doubt in my mind now, after having been to a protestant "Bible Only" church for many years, that the Catholic (Universal) Church is what Christ founded. Period.
Remember after Christ was ressurected, he was walking with two disciples that DID NOT RECOGNIZE HIM, even though they were discussing the scriptures that described the Messiah!
It was NOT UNTIL they broke bread together that it was revealed to them that He was Christ, the Son of the Living God!
This, my friends, is exactly what is truly revealed in the Catholic Mass, which is constantly being celebrated at some place on earth 24x7x365.
I was SO TIRED of disagreements in bible study and Sunday school between Elders, Pastors, and laymen, that I needed to know the unbroken truth that was taught and handed down since the time of the apostles.
The Catholic Church has been there since day 1. My church had been around for 100+ years, and today there are 38,000 + variations of Christianity. Christ prayed for UNITY for his people. Is this what we have? NO!
If anyone is interested, I can provide the names of three KEY books that prove without a doubt that the ONLY way to understand the fullness of truth of Christ is to get the truth from the source of apostolic teaching handed down since day 1: The Catholic Church.
I am SURE some will argue with me -- BELIEVE ME, I was on your side for years, until I got off my butt and decided to find out the truth.
When you realize this, there is NO going back.