thanks to the written system of ancient Mesopotamia, we have a REALLY good idea as to the procedures of the types of events that are typically shrouded in mysticism, such as marriage, birth of children, etc. The Mesopotamian's obsession with keeping logistical records has allowed us to see that a marriage contract to them was pretty much the same type of "contract" that we think of today. there were a lot of weird little rules and exceptions, however that differ greatly from modern marital laws. surprisingly, i wasn't able to find a lot of evidence for "mystical" procedures involved with marriage. in fact, the Mesopotamian wedding ceremony seems a lot less weird than Korean Thanksgiving. the only "odd" practice is when the groom pours perfume on the bride's head - but who doesn't want to smell nice on their wedding day, right?
there are a few traces of mystic beliefs in Mesopotamian lore. In the epic of Gilgamesh, there is an interesting series of dreams predicting the future (as interpreted by Gilgamesh's mother), strongly suggesting that dreams were a big part of how Mesopotamians believed they had mystical experiences. there is also strong evidence of a link between what Christians may call gentile beliefs and the beliefs of the people of israel - the biblical " Merkabah " or Ezekiel's chariot dream, contains mythical images that correspond to Mesopotamian traditions(Vita Daphna Arbel)
what commonly accepted things in our society may be considered "mysticism" in 500 years?