Your description is actually not a typical OBE. You were describing an abnormal dream. It is possible to get an abnormal dream. The Gemara implies that even when the dream is not from your own imagination, your imagination gets in the way. There is, however, a concept of a lucid dream. As the Ohr Hachaim Hakadosh explains, when you are aware of it being a dream, during the dream, then it is clearly a message.
Now this is separate from the experience of the clinically dead who have experienced life after death. The reason they don’t change religion is because the experience merely shows them that there is a soul.
People were able to relate facts that they couldn’t have known otherwise, and the self awareness was stronger than our waking hours.