Uh, I think pretty much all christian denominations would say everyone else does not know what real christianity. My wife says it all the time when I point out some absurdity of religion. I'll bet $100 she's not in the same sect/group you are.
Yours is wrong, ours is right. Yours is misguided, ours knows the true way. Yours is corrupt, ours is trustworthy and wholesome. Yours won't help your soul reach enlightenment, ours will save you. Yours is counterfeit, ours is real.
Any serious Christain who seriously studies history will see clearly that the Catholic Church as it is now is the same as it was on Pentecost, being the true church from the beginning, and that all Protestant churches have descended from it and decided to change their doctrines for various non-legitimate reasons.
But you bring up a good question: why aren’t these things recorded or seen more publicly? Well, you know the major theory around why spam has so many obvious warning signs like major typos, unprofessional fonts, and silly plots? It’s to filter out everyone but the most gullible and desperate. God uses the same principle. He makes situations where it’s like 99.9% an obvious certainty but leaves 0.1% possibility for doubt, for those people who just don’t want to believe.
There’s no shame in using a want to believe as your starting point for investigating it. Check out resources online for the historicity or the Resurrection from a Catholic point of view (the only intellectually satisfying denomination) and you’ll find that it’s so extremely probable to the point of being basically verified.