TBF, the structural differences if the protestant faith and the catholic faith were viable at the start. The catholics had a reformation and because they actually looked at the protestant doctrines and were like “yeah, ya’know, fair” to a lot of them. Meanwhile, Protestantism got popular with the the elites because they misinterpreted Martin Luther’s philosophy to basically say that just paying lip service to God can still get you into heaven and so they could save a bundle on tithes and treat faith a performance art. Which is how you got assholes like the Calvinists.

In case you were thinking I was feeding into the thesis of the thread, neither of them are wholly correct, which is true of most religions, but if you look at the them purely objectively, Catholicism is “more correct” than Protestantism, as Catholics at least expect their practitioners to perform “good works” in their communities as a requirement rather than a strong suggestion.