It is true that the modern Christian is less robust, but that is not thanks to Christianity; it is thanks to the generations of freethinkers, who from the Renaissance to the present day, have made Christians ashamed of many of their traditional beliefs. It is amusing to hear the modern Christian telling you how mild and rationalistic Christianity really is and ignoring the fact that all its mildness and rationalism is due to the teaching of men who in their own day were persecuted by all orthodox Christians.
Source: Bertrand Russell: Has Religion Made Useful Contributions to Civilization? 1930.
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