Papal Infallibility?
The Vatican doctrine cannot be always right and reasonable. Once the Vatican blamed Judaism and Jewish people officially:
Pope St. Gregory (the Pope of the Catholic Church between 590 and 604 AD) stigmatized Judaism and the Jewish people in many of his writings. He described Jews as enemies of Christ: "The more the Holy Spirit fills the world, the more perverse hatred dominates the souls of the Jews." He labeled all heresy as "Jewish", claiming that Judaism would "pollute [Catholics and] deceive them with sacrilegious seduction."[32] The identification of Jews and heretics in particular occurred several times in Roman-Christian law.
https://en.wikipedia.org/wiki/Heresy#CatholicismThe Vatican's creeds might include some mistakes. It is not sound and reasonable that it still sticks to the ideology established in the Roman Empire. For example, its doctrine of the Trinity might be wrong as it is wrong to stigmatize Judaism and Judaists.
Especially if Jesus is God, why should the religion based on the belief that Jesus is God be called Christianity? Christianity must be the religion based on the belief that Jesus is the Christ or the Messiah. To believe that Jesus is God or not should belong to an individual belief. Nobody should force people to accept this belief.
Papal infallibility cannot be accepted.
Papal infallibility is a dogma of the Catholic Church that states that, in virtue of the promise of Jesus to Peter, the Pope is preserved from the possibility of error "when, in the exercise of his office as shepherd and teacher of all Christians, in virtue of his supreme apostolic authority, he defines a doctrine concerning faith or morals to be held by the whole Church."
https://en.wikipedia.org/wiki/Papal_infallibility
However, Christ Jesus never clearly declared that Peter and successive Popes were free from error, which Christ Jesus guaranteed.
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Luk 5:12 And it came to pass, when he was in a certain city, behold a man full of leprosy: who seeing Jesus fell on his face, and besought him, saying, Lord, if thou wilt, thou canst make me clean.
Luk 5:13 And he put forth his hand, and touched him, saying, I will: be thou clean. And immediately the leprosy departed from him.
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Luk 5:12 And it came to pass, when he was in a certain city, behold a man full of leprosy: who seeing Jesus fell on his face, and besought him, saying, Lord, if thou wilt, thou canst make me clean.
Luk 5:13 And he put forth his hand, and touched him, saying, I will: be thou clean. And immediately the leprosy departed from him.