Your dream is within normal parameters. You looked under your bed and saw all the old feelings and memories of you past hidden in all those old boxes. All those now dead demons and phobias. You are doing well in you Healing. I don't think those "Demons" are coming back, not any more.

Feel free to have that floating sensation again. This time it means being free, and you are healing, rather than escaping and disassociation. Religion is all about control and social order. They were trying to scare you, so they can have some control over you. But the fear they were trying put in you was false and unreal. Most Religions use Fear to keep social order in their followers.