I find that every mushroom trip starts with fear. I can sense the trip coming, like a surfer waiting for the tidal wave that is forming on the horizon. Mastering that fear becomes the key to the trip; learning to let everything happen, including the fear, opens the mind for what is to come.
I would imagine, if God were to appear to me, it would be terrifying yet joyous, much like a shroom trip. Maybe, EXACTLY like a shroom trip.
The Rev