Belief in God is rational. Everything has a cause. So unless there is a first cause, then you would have an infinite regress. And then nothing could exist. Therefore there must be a first cause. Therefore God, the first cause, exists. QED.
31.10.22
אספר כל נפאותיך psalm 105. [''I will say over all of Your works.''] Is not the Universe the work of God? Since it is, saying over the Physics and Mathematics that describe it, is saying over the workss of God. You see this idea in the Rambam and other Rishonim like Ibn Pakuda. In the Rambam you see this in the story of the King where the scholars of Talmud axe outside his palace nd the Physicists are inside. [That is at the end of one of the volumes of the Guide for the Perplexed--but I forget which volume. I think after vol. III or IV.]