See? Now that i can understand.
How do you know? Ceremonies practically beg to be of religious origin of some kind, many things are. How do we even know what has a religious origin or not? Just because some old guy scribbled it on a few papers? If you were to scribble a few things on a paper and someone were to find it 2000 years later they'd probably believe what you've written even if what you've written is totally not the truth, given there are no ways of proving otherwise. Just like we can't prove that Jesus ever existed nor that he woke up from the dead again. Maybe someone simply carried him out as prank? Who knows if not some necrophilia dude grabbed his corpse and raped it in the backyard then burned his corpse to ash? All we can say is that a dude waking up from the dead can only mean 2 things, either he wasn't dead because health monitoring wasn't that good back then (and even today it can still happen that someone is declared dead and then wakes up in a coffin later) or because it's simply a lie, a prank or just a story that was told to kids or parents to squeeze money out of them with religion.