Buddhism, the "religion of wisdom," is an extremely rational religion.

Buddhism Day by Day

Wisdom for Modern Life by Daisaku Ikeda
Thursday, January 31, 2013:

 

A higher religion does not negate rationality. No religion that suppresses human reason can earn the trust of humankind. Buddhism, the "religion of wisdom," is an extremely rational religion. In fact, it is so rational that many Westerners even question whether it can be classified as a religion, since it does not teach the existence of a supreme being in the image of humankind.