I don't mean to be putting words in your mouth OP but it sounds like you are talking about some kind of consciousness "theory" that says our brains could be connected to some computer or something that creates the illusion of the world around us and generates the feelings of things we smell, taste, feel, etc. when we interact with them in this "dream". My argument to that is why then do we die if we take a dagger to the heart if the only thing that truly exists is our brain? I can understand how we could feel the pain of the dagger based on this "theory" but I have trouble rationalizing why we would die if our heart is only an illusion and the only thing that really exists is our brain.
“You don't get to advertise all the good that your religion does without first scrupulously subtracting all the harm it does and considering seriously the question of whether some other religion, or no religion at all, does better. ”
― Daniel C. Dennett
― Daniel C. Dennett