Someone said :
The whole veneration of saints thing and their body parts and clothes makes Catholicism embarrassing!
(besides the other stuff)
They reckoned that if they could not beat the pagans and heathens and their idols, they had to join them by renaming idols and miscellaneous gods: "Saints".
A bit like the Muslim who refuse physical representations and imagery, but instead venerate the hand of Fatima (a body part), and the actual letters of the writing.
You cannot remove superstition from religions. You can only rename it.