In early Christianity the relics of saints (Peter, Paul, martyrs, etc.) and their tombs (if they were buried) were carefully preserved and venerated. No matter what you think about this practice–and you may want to give it some thought–it is a matter of historic record.
But there is a complete absence of Marian relics. How would you explain this?
“And a great sign appeared in heaven: a woman clothed with the sun, with the moon under her feet, and on her head a crown of twelve stars. She was pregnant and was crying out in birth pains and the agony of giving birth. And another sign appeared in heaven: behold, a great red dragon, with seven heads and ten horns, and on his heads seven diadems. His tail swept down a third of the stars of heaven and cast them to the earth. And the dragon stood before the woman who was about to give birth, so that when she bore her child he might devour it. She gave birth to a male child, one who is to rule all the nations with a rod of iron, but her child was caught up to God and to his throne,” Revelation 12:1-5
Most Protestant scholars believe that this passage–specifically the woman and the twelve stars refers to both the Old Testament ecclesia and the 12 tribes of the New Testament ecclesia and the twelve apostles. Catholic scholars agree, but also add Mary as another subject of this passage. If you don’t think that is true or at least a possibility, why?***
** “It is the glory of man to search out a matter.” (Proverbs 25:2b) I learned a long time ago an important key in discerning truth: Acknowledge that I don’t know what I don’t know. And to then beware of rejecting things reflexively because the “tribe” (hivemind) I inhabit (we all do whether you like it or not) has taught me certain presuppositions and “facts” that predispose in me a bias (sometimes unconscious) against certain truths that other Christians accept.
*** You would do well to reflect on “His tail swept down a third of the stars of heaven and cast them to the earth.” When did that happen?