This is not an accurate statement, most religions have been, mostly, very tollerant. Persecution of Christian heretics in the form of torture and burning didn't get off the ground until about 1250 AD in most of Europe, and was illegal in England until 1401, when the infamus lex ad infernus (or something, I forget the name) was passed. That's 800-1000 years of relative peace. Similarly, Christians and Muslims were able to get along reasonably well even while the Crusades were ongoing.
The exception is during times of war, but one only has to look at conflicts of the 20th and 21st Centuries to see that is not a facet of religion, but of human nature.
Rhy's point, I believe, is that 300 years ago Science would have been castigated and restricted for dissagreeing with "obvious" religious truths, while today the opposite is happening.
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