Inescapably, though, it is a non-falsifiable claim, and therefore not rational. But it is comforting to those who hold the belief.
But the only bearing comfort has on science is in ergonomics.
The old religions have had to move perpetually backwards. God used to live on the mountain. When we reached the top of the mountain, and God was not there, God went to the clouds and the sky. And when we went to ...the sky, and God was not there, God went to space. But God has not been found in space, he has not been found in the sun, or on the moon, or in the caves or on the ocean floor. He has not been found in the cells or in the atoms or in the spaces in between the atoms. He has not been found in the solar system or in the galaxy. He has not been found in the light matter, he has not been found in the dark matter, he has not been found in the wavelengths or in the echoes from the beginning of time.
There is not one touch of the divine upon anything in this universe, and those who need to debase the human experience and human progress by attributing it to some designer have been forced to ignore evidence, or to banish their gods to ever more remote places in the vain hope that science will not reach there, or that when it does, maybe, perhaps, THIS TIME they will find God. They have been forced to bend over backwards to claim credit for god when it is the glory of man which they should revel in, the glory of our civilization, the wealth that we reap for the struggle and adversity that we have overcome.
It is a perversion.
And it is not rational; nor is it desirable in any sense. The churches and the cults can say all they want how grand the design of the creator is, but ultimately, deeply, they know they are clinging to the flotsam of the false hope they peddle.