Consider “White”. It is a qualia like other “colors”, and shares the same essence. It materially does not exist. It is immaterial.

However White differs from other qualia in an important way. White does not even have a message transfer component, which IS material, i.e. photons at call it 350 THz transmits the information “Red” (though this is just a guess, as my “Red” might be your “Green”).

However White does not have this. We “see” white when a full spectrum of photons strikes our cones. The cones do not have the resolution to separate out the various photons, and so the impulse of all of the frequencies sent through the optic nerve is perceived as “White”. However in the material world there is NO frequency that corresponds to “White”. Think about it until you get it. Not only is White qua White immaterial, there is nothing in the material world that corresponds to transmitting “White”.

The proof is easy. Shine red light at a whiteboard, and you will see a red board. Another proof is the prism, which reveals the “White” is a mirage, in fact there is a full spectrum of frequencies present.

The significance of this is in the existence theorem. Note there is no existence theorem for qualia. However you could START an existence theorem for most qualia, however you eventually reach a dead end. So an existence theorem for “Red” would START with observing that 350 THz photons corresponds with Red. You can’t even START an existence theorem with “White”.

The immaterial world exists, and that is a fatal error for atheism.