“I can’t help but think that the reason why these things are exalted is to propagate the Roman Catholic religion and assert it MUST be true because of these miracles.”
Of course that is the reason. It’s exactly why these old bones were trotted out to be displayed on this thread, isn’t it? Yet they are not incorruptible, or unique, and it some cases the claims made about them amount to outright fraud.
Now, I ask: if Roman Catholicism is the One True Religion from God, then why do they need fraudulent miracles to prove their case?
Insecurity?
Excellent question! Like Abraham told the rich man in Hades, who had begged him to send a risen Lazarus back to his family to warn them of hell, "If they do not listen to Moses and the Prophets, they will not be convinced even if someone rises from the dead." (Luke 16:31)