Ceremony in religious practice is intended to initiate a state of ego dissociation and provide an avenue for belief, faith and a direct interface with deity. It effectively cross references the hemispheres of the brain and allows the mystical experience to become “real”.
I think it is necessary, at least in the beginning stages. Which is why most mystery schools within traditional religious structure are centered around rules, laws and commandments. This is the initiatory stage. Once the processes have become internalized and the mind is able to switch on the god module, they are no longer requisite to the actual process.
Mythos demands a disconnect from the logic centers in order for experiential learning to occur. Ceremony can provide that. The sense of silliness, embarrassment, awe, shock etc in conjunction with participation in any given spiritual ceremony is indicative of the imaginative centers coming on line and the logic centers or ego fighting to maintain a foothold in perceived reality.
That is why Christ exhorted us to become as children if we are to enter the kingdom of god. Especially if the kingdom is within us. Disconnect from the ego and freefall into ourselves to see the face of god reflected in our own structure. I feel that is what he was teaching.
Let go and let be. Be still and know that I am God. These are concepts, in my thinking, dealing with the necessity of surrender to the creative centers as a prerequisite to experiencing and interfacing the Creator.