There's a song that I learned in church camp many years ago. The chorus goes "And they'll know we are Christians by our love, by our love. And they'll know we are Christians by our love".
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Estimates of crusade deaths range from as low as 1 million people all the way to 9 million
Inquisition, not that bad, 30,000 - 300,000.
https://www.theguardian.com/world/2004/jun/16/artsandhumanities.internationaleducationnews
Estimates of the number killed by the Spanish Inquisition, which Sixtus IV authorised in a papal bull in 1478, have ranged from 30,000 to 300,000. Some historians are convinced that millions died.
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WWII, 50,000,000 - 80,000,000. (Catholics fought on both sides.)
Mark 13:7 When you hear of wars and rumors of wars, do not be alarmed. Such things must happen, but the end is still to come.
Matthew 24:6 You will hear of wars and rumors of wars, but see to it that you are not alarmed. Such things must happen, but the end is still to come.
Luke 21:9 When you hear of wars and uprisings, do not be frightened. These things must happen first, but the end will not come right away.”