Adding to the above:
Distance, mass, time are real.
Metres, kilograms, and seconds are units we made up so that its possible for us to quantify and compare real distances, masses, and times. We can change the unit of measurement without changing how much distance, mass, or time is really there. If I say you have 454 grams or 1 pound of butter its still the same amount of butter. The units are imaginary, the quantity of butter is real.
Here is the quantitative difference between abstract measures and the abstract concept of god. We can measure out with real physical; devices and demonstrate using science the very thing that only exists physically in abstract thought. Such as Metres, kilograms, and seconds, state lines points on a compass.
Volts watts and all abstract units can be shown to physically exist. Because these things exist in reality but are understood in abstract in relation to the physical reality.
Unfortunately Charles, I nor anyone else can measure out to demonstrate the physical reality of god. With any known device tool or method and what makes it even more illusionary, is the fact it cant be demonstrated to be real by any effect that can be measured.