The Roman Catholic Church is very different from the church of 1900+ years ago. Over time, due to human unfaithfulness, it evolved into something else. The original Church apparently chose, by inspirtation of the Holy Spirit, not to preserve knowledge of a lot of things, including, for example, much about the lives of the original apostles and Jesus’s known family, including His brothers and Mary, His mother. If God had intended it, He could have made sure that knowledge was preserved, including preserving a “royal line” of Christians coming from Jesus’ relatives, as it’s likely some reproduced. We could have the same with the original twelve disciples. But we don’t have that. Just on the matter of Mary and Jesus’ brothers, it’s an inescapable conclusion that the Church consciously and deliberately opposed preserving knowledge of their lives here on earth, including after Jesus’ resurrection, and the reason for that is that Jesus alone is God and everyone was wholly devoted to Him alone. That is clear in the New Testament from the first to the last. But there is still a human tendency to get into such things, and while it was opposed in the original church, it crept back in over time, over many centuries.
So are you saying that your protestant brethern never figured out anything you mentioned and then all of a sudden they got a ‘divine inspiration’ that everything that came before them for 1500 years was wrong?
AMDG