I want to know the answers to these questions. Sorry if they are random.
Why should we all believe one thing? Why can’t we just believe in fundamental things like in Jesus? Why can’t Christ be capable of overcoming all our differences? Since we weren’t there, Christ’s message might have been interpreted differently by different people - but they all believed in him and isn’t that what matters? Isn’t it like just different parts of a body - we aren’t all the same, but belief in Christ makes us one?
We should all believe one thing because usually only one thing out of any set of alternatives is true, and Jesus is Truth personified and came to teach that one truth to us.
‘You shall know the truth, and the truth shall set you free’. ‘Whoever knows the truth hears My voice’.
He wants us to know the truth, and that which speaks the truth speaks with His voice. So we can and must seek out the one truth. Otherwise His promises in the verses above are a lie, and Jesus was not a liar!
Consider the hugely different beliefs Christians have:
Exhibit a) - either Mary was really and literally a virgin or not. You can’t have it both ways - one of those statements is true and the other false.
If you believe the option which is false one, you are not hearing Jesus’ voice, are not free but enslaved (since falsehood IS bondage and truth IS freedom), and are not properly part of Him who is Truth personified.
Exhibit b) - either the Eucharist is really and literally Jesus’ Body and Blood, or it is only a symbol. Again, both statements cannot be true. If you believe a falsehood, again you are not hearing Jesus’ voice, and you are not part of Him.
Exhibit c) - either Jesus established ONE church, founded (after Himself) upon the Apostle Peter and his successors (the Catholic Popes), which He promised would stand till the end against even the gates of Hell, and which church is the same thing as the Catholic Church of today, OR He did not and it is not. You know the rest.