I am not presuming anything - I am asking you.
You can believe whatever you want, Jacob.
Since you are asking why I believe Catholicism to be true, I will answer you.
I was not raised in church. Jesus made Himself known to me when I was young and attending a Protestant Church Camp. I went on to a Protestant College and became a youth director at a Presbyterian Church. Later, I went to graduate school and met a Catholic in my program. I assumed that she was Catholic because she had never heard about Christianity. I was arrogant and believing it was my job to expose her religion for what it was - an empty shell - gutted and refined by the Reformation. After our first conversation, I realized that I was talking to an educated Catholic - someone who knew her faith, doctrine, church history and apologetics. I didn't know anything about Church history and barely anything about Catholicism. She taught me a great deal about the Catholic Church and I spent the next 2 years learning everything I could about Church history and Catholic doctrine. Then, I decided to join the church - it was a year long process. Later, I got involved in a local monastery and became a Benedictine oblate.
I believe the Catholic Church is the Church Jesus started on Earth - I believe it because I had a spiritual revelation after taking the Eucharist and all of the study I did regarding Church History is congruent with Catholic doctrine. I also realized that sola scriptura - the scriptural basis for Protestantism is not supported by the Bible. Also, the Reformation has failed to reform the church - it has replaced Catholic Tradition with it's own traditions, but fails to admit it.
The good thing and the most important thing about Protestantism is that it has adopted many truths from Catholicism like the Trinity, the doctrine of the incarnation and most of the cannon of the Bible. I believe the Pope is correct when he affirmed that enough of the truth has been preserved with Protestantism to remain Christian. I believe i was justified before I became Catholic. I consider all born again Protestants my brothers and sister in Christ.
As far as Mormonism is concerned - it is a result of the Protestant Reformation. It is one of the 19th century cults, like the Millerites, Shakers, Quakers, Christian Scientists, JWs and Seventh Day Adventists - although, to be clear - none of these religions have enough of the truth to be considered Christian. You should reject Mormon doctrine because they reject the true nature of God as a Trinity. There are a lot of other reasons to reject their doctrine, but they do not even matter because Mormons are not even Trinitarian.
Do you have anymore questions?
You said you had a spiritual revelation....it sounds like you fell in love with the Catholic religion.
I'm not Protestant. My beliefs are that of the first Christians, as taught by Jesus and the apostles of the New Testament. And in the New Testament, there is no Catholic church, no anything resembling it as far as the true beliefs go. There is no name "Catholic." There is no calling of a man "Holy Father," nor "pope." There is no talk and about making statues; nor keeping material objects from "Saints" and venerating those objects. There are no incidences of digging up the deceased and displaying them in glass caskets, and venerating the decayed.. There are no examples in the Bible about praying to the dead; nor venerating and praying to the Lord's mother. There are no restrictions on getting married, and eating meat, like the Catholics. There isn't an example in the Bible about any apostle turning the bread and wine into the real body and blood of Jesus. There is no confession box. There are no examples of special clothing and hats for the leader of the church, no special chairs, like that of the Catholics leaders. No instructions and use of "holy water."
The Catholics believe they can add to the teachings found in the Bible. But the Bible warns about adding or subtracting from God's word. Deuteronomy 4:2, Proverbs 30:5-6 and Revelation 22:18-19.
The Catholics believe in what they call oral Traditions. But Jesus warns against traditions.
Jesus denounced tradition as keeping man from the reality of the truth:
Matthew 15:6-9 "... Thus have ye made the commandment of God of none effect by your tradition. Ye hypocrites, well did Esaias prophesy of you, saying, This people draweth nigh unto me with their mouth, and honoureth me with their lips; but their heart is far from me. But in vain they do worship me, teaching for doctrines the commandments of men."
We displease God when we follow tradition or church laws or any human standard as the source of authority for the church (Matthew 15:1-14; Colossians 2:8; Galatians 1:6-9; Proverbs 14:12; 2 John 9-11; Jeremiah 10:23).
The original apostles received all the truth we need to guide us to eternal life, and they wrote this down in the Scriptures (John 16:13; 2 Pet. 1:3; Acts 20:20,27; Matt. 28:20; I Cor. 14:37; 2 Tim. 3:16,17).
Only Jesus can furnish our right standing and peace with God. Repent of all else and rest on the faithfulness of Christ Jesus alone,
"forasmuch as ye know that ye were not redeemed with corruptible things, as silver and gold, from your vain conversation received by tradition from your fathers; but with the precious blood of Christ, as of a lamb without blemish and without spot."
1Peter 1:18