AH, but there is indeed a lot of reason in some religious sentiment, Ake. "Do unto others as you would be done unto" is a practical guideline. So is a reminder to look unto the lilies of the field, etc. So are hundreds of other truths and aphorisms from Old Testament, New Testament, Buddhist, Muslim, Taoist, Zen, and othe religious sacred writings.
To translate these perfectly useful sentiments into concerns that are open to argument and amenable to reason requires only that one understand the reasoning behind his assertions well enough to make the translation. Blind faith can't serve simply because it is not shared, but there are universal concerns and universal languauge into which "religious" impulses can be translated.