It activates the right brain. If you dont have spiritual experiences you dont have a very active right brain. If you already have a very active right brain then you will most likely be having some sort of "spiritual" experiences..and I dont know why DMT would not give you those experiences..unless you analyze everything to death(which is left brain not right brain activity)...If you are mostly left brain dominant you most likely analyze everything and perhaps that voice in your head wont shut up unless you take a really large dose of DMT and smaller doses will just annoy and confuse your ego or left brain consciousness.

It is all abotu hemispheres IMO.