Franz Kafka

We shall suffer no attachment to literature, no taste for abstract discussion, no love of purely intellectual theories, to seduce us from our devotion to the cause of the oppressed, the down trodden, the insulted and injured masses of our fellow men.

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.