This reminds me of a tour I was once on, by one of the resident archaeologists in the open-air museum in Biskupin, Poland. It's the site of an iron age fortified settlement and there is both ongoing archaeological excavation and a reconstruction of sections of the settlement for visitors.

Anyway, the archaeologist showed me a shallow elongated oval wooden vessel with a slight depression in it, that had been on display. She explained that for a very long time it had been believed it was used for offerings as part of religious ceremonies. Only when she first began working there as a student this struck her as odd since she remembered her grandma had used an almost identical vessel for kneading dough for bread. Needless to say, its purpose has since been relabeled.

Her observation to me was that in archaeology, any time researchers are uncertain of the purpose of an object they tend to ascribe a religious meaning to it and so any time an object is described as having a religious significance one should always take that assessment with a grain of salt.