No other single innovation had so much impact on history.

People value religion on the basis of cost, and they don't value the cheapest ones the most. Religions that ask nothing get nothing.

... One thing about religious truths is that we have to take them on faith, and faith needs reassurance. What's more reassuring than noticing that some other people, whom you admire, are so certain that it's all true that they're willing to go the ultimate mile?

... All questions concerning the rise of Christianity are one: How was it done? How did a tiny and obscure messianic movement from the edge of the Roman Empire dislodge classical paganism and become the dominant faith of Western civilization? Although this is the only question, it requires many answers - no one thing led to the triumph of Christianity.