George William Russell

By intensity of hatred, nations create in themselves the character that they imagine in their enemies. Hence it comes that all passionate conflicts result in an interchange of characteristics. We might say with truth, those who hate open a door by which their enemies enter and make their own the secret places of the heart.

There are clearly many good politicians who are guided by religious belief, so the mix can work. But there's a line to be drawn. It would be hugely dangerous for a country's laws to be set by the scriptures, and particularly those of the expansionist religions.