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Many political systems, including the american constitution and political leaders make extensive reference to God and religious ideals. Soviet communism was notable in representing a system supposedly based on reason rather than upon religious ideals.
The soviet suppression of religion did not really seem to make the CCCP a better place.

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If you insist on using Soviet Communism as an example of "reason" then I will insist on using Spanish Inquisition as an example of Christian "compassion". And we will get nowhere.

Oh, and P.S., your premise is entirely wrong. The founding fathers were likely more influenced by reason than Christian ethics. Men like Jefferson were students of the Age of Enlightenment and the authors of that period. And thus they built a government based more on reason than Christian dogma, otherwise there would be no need for a separation of church and state if you believe that the goal was to codify christian morality.