The Catholic Church is an institution I am bound to hold divine - but for unbelievers a proof of its divinity might be found in the fact that no merely human institution conducted with such knavish imbecility would have lasted a fortnight. Hilaire Belloc
O that unbelievers would learn of faithful Abraham, and believe whatever is revealed from God, though they cannot fully comprehend it! Abraham knew God commanded him to offer up his son, and therefore believed, notwithstanding carnal reasoning might suggest may objections. George Whitefield
A perfect faith is nowhere to be found, so it follows that all of us are partly unbelievers. John Calvin
The Islamic doctrine of slavery was closely linked with the doctrine of the inescapable struggle between believers and unbelievers... and Pagans were routinely sold into slavery if they had the misfortune of being captured by Muslims. Koenraad Elst
... generally speaking, Muslim tolerance of unbelievers was far better than anything available in Christendom, until the rise of secularism in the 17th century. Bernard Lewis
The only separation the Bible knows is between believers on the one hand and unbelievers on the other. Any other kind of separation, division, disunity is of the devil. It is evil and from sin. Desmond Tutu