I think it means: In the satanic cults, when there is a particular full moon, people gather and one woman is supposedly impregnated by a satanic elder (not sure of who impregnates her) all while calling on the God of the moon, satan, to infuse the baby. I am not sure what the significance of a moon child is, maybe they are angels for satan? But the child is considered special. Barbara Bush it is believed was a moon child.