Energy is still a physical thing in the physical world, atoms are physical. Existence of a non-physical entity has not be proven nor it can be proven, but so far what we see around is all physical, thus there is no point in believing in non-physical. This would be the same as to believe in Paradise and Hell and God
But if you like to believe in things without facts, such as God, a flying strawberry and a non-physical entity, then nothing can be done.
Non-physical realities may not be proven by physical means, but why should that be a shock. It's a bit like looking for non-visable light waves with a shovel. The're just not using the proper tools. Experience is such a tool. Who needs a temperature gauge to determine if a stove is hot. Even if one wasn't there to see the stove, a hand full of blisters is some evidence worth considering.
It reminds me of the guy who walked up upon another who was looking around on the ground for something. "What are you looking for?" he asked. "My keys" said the man on the ground. The kind man immediately got down on the ground and began to help, but after awhile he asked, "are you sure you lost them here?" "No" the man replied. "I didn't lose them here at all. It's just that the light is so much better here!"
Materialist scientists look where they see the familiar. They are not looking where the answers lay. But it's to be expected from those who have an underlying bias toward exclusively material answers. There was a time when the best scientists and doctors of their day would 'bleed' a patient in an attempt to cure them. They were wrong then and many of today's scientists are no less ruled by a belief and ideology that blinds them to a clear understanding of life.
Non-physical reality has been experienced countless times, and continues to be so at an ever increasing pace. These are facts that materialists try their best to explain away by imaginative theories, or simply ignore. Flying strawberries, or even the tired aspersion of spaghetti monsters, are vain attempts to insult those who hold a different view. No doubt it must feel quite special to perceive oneself so superior as to suggest such an analogy to a well research phenomena.