Then may I suggest that the answer to your OP is "it isn't"?
Rory, where to you get this Bollocks, seriously?
Leaving aside your general point the specifics are - frankly - malicious falshoods at best.
Constantine did not convert to Christianity because "it would forgive him", nor did he abandon other Gods - such a concept as Monotheism was far too Alien too him.
Now, the Crusades are noted for the discrimination with which the Crusaders slew Muslims and sometimes Jews whilst leaving the Christians largely unmolested, especially during the sack of Jerusalem. The same Christian sources which note that the horses (shamefully) had to wade through blood and gore report that the Catholics protected the Orthodox Christians during the sacking.
You could dispute that, of course, but then you'd have to equally dispute the claimed acts of brutality.
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