I can understand your aversion to the use of the term 'religion' to describe an emotional and psychological attitude which shows itself most clearly in Spinoza... I have not found a better expression than 'religious' for the trust in the rational nature of reality that is, at least to a certain extent, accessible to human reason.
"Einstein and Oppenheimer". Book by Silvan S. Schweber, Harvard University Press, p. 291, 2009.