The sheer absurdity of the argument astonishes.
In the early age of human scientific thought, it was supposed that through simply thinking things through logically, truths could be deduced about the universe without empirical evidence.
The ancients could prove things geometrically through scientific reasoning without seeing actual squares or triangles; consequently, they imagined they could lay back and arrive to perfect truth without ever conducting a single experiment or observing a single phenomenon — a priori reasoning, mere armchair ratiocination.
Back then, to assert the existence of a deity required no physical evidence, no observed proof, nothing in support of any kind other than clever philosophical suppositions.
That was over two thousand years ago.
Evolve.