I can’t mind that people who aspire to rationality laugh at religion. Someday I will rectify the two. But I think the key lies in the fact that the eternal spiritual realm that lies beyond this one is a type of matter that does not interact with the 4 fundamental forces of nature, as we know them. A part of me is made of this beyond-dark matter. Invisible matter. That the spiritual realm speaks to my spiritual self/mind which is intangibly and invisibly tied to my physical self.
That is how I tie in my spirituality with my rationality. One gear in my rationalist machine is the influence of the eternal and divine realm that lies beyond this one. An influence that I can access with my soul.