I think i know what the markings on the alter are for and i am very disturbed by this. I think its so ritually they can place 6 kids on there and murder them. Reminds me of pizza i know there is an occult aspect. It doesn't resemble any obvious symbol at first.
Symbolism will be their downfall
Maybe the red shoes are for doing these rituals because see how the blood flows with a fucking drainage system their shoes would be soaked in blood.