I remember a nun, who put an apple in one hand, then held up both hands for us to look at.
"Which is more perfect - the IMAGINARY apple in this hand, or the real apple in the other?"
Another question - "Which is more perfect - the imaginary invisible Gods bottom I am praying to, or the REAL invisible Gods bottom I am praying to?"
Last Question: "Which is more perfect - the imaginary red polka dotted handkerchief in one pocket, or the real red polka dotted handkerchief in the other? And NO! you may not turn out my pockets to verify this."
Since we cannot "turn out the pockets" of the universe, there is no way of knowing whether the imaginary or actual invisible God exists.
You cannot prove that because you can imagine something better than what you have imagined it must therefore exist.
HB