Why People Are Giving Only Archaeological Values To The Relics Of Saints?

They are not kept in ice or herbs or something like that. And there were other people(monks) buryed in the same place as the relics of saints and they have rotted. There is no logical explanation for this. Why people say that there must be an logic explanation ? Is not that a cover for the their wish not to believe? I live in a country where there are relics of saints.So I have more information than people that are not religious.Why many people are telling their opinion even thety don tknow much about it?