According to you this alleged "spiritual form of energy" is "omnipresent" therefore it must be detectable if "humans have the capacity to connect to it".
When humans are in a state of "spiritual awareness" that is reflected through the scientifically measurable state of the brainwaves which are the electrical energy generated by the brain. Since that electrical energy has a physical source that is producing this "spiritual form of energy" your entire premise that "God is a spiritual form of energy, it can't be measured physically" is utterly bogus.
It is detectible, spiritually. That's why so many people believe in it. You are trying to argue that because we have brainwaves while we are spiritually connecting, there isn't a spiritual energy we are connecting to and it's just a byproduct of our brainwaves. Well then, this means nothing is real and reality doesn't exist, it is all just an illusion byproduct of our brainwaves.
The mind is not producing spiritual energy, it is connecting to it. This spiritual energy is the source of inspiration. Billions and billions of people who have experienced spiritual connection are convinced it is real. Now, maybe everything that is real is an illusion, but spiritual connection is certainly a vital part of that illusion.