Hmm? Thomas Bayes was a Presbyterian minister, C. S. Peirce was Catholic and Newton was an unorthodox Christian described as "highly religious". I'd be more interested in seeing a list of esteemed rationalists who were not religious compared to such a list that were religious. In any case, it is pretty clear that it is possible to hold rationality and religion in your head at the same time. This is basically how most people operate.