Radio waves in the 1800s.
They'd been an invisible presence in
The atmosphere all through the
Ages, but it was Heinrich Hertz who
Created a simple device to receive them,
To prove their existence.
My knowledge of physics is abysmal,
But I can borrow the principle.
God is also invisible, but it doesn't mean
He's not operative in the universe.
The reason people believe He's just a
Myth,
That He doesn't exist is because they
Haven't opened their hearts and
Minds to receive Him.