It is typical of the left to use aberrations of Christianity that do not reflect God's will, or Christ-like behavior as representative of what Christianity is, but it is absolutely specious to do so.
Try again. (and leave out the Crusades).
The Spanish Inquisition was a sinful manifestation of incorrect theology,
That's not what was being said at the time. Quite the contrary. IIRC, it's purpose was to aggressively, and if necessary violently, purge 'incorrect theology'. This is usually called persecution of those who don't agree with you.
And I am not a member of the left, it is now viewed as an aberration of Christianity but it wasn't at the time, and it is not specious to point it out as an example of religious persecution akin to Bin Laden's (and the Taliban's) persecution and treatment of 'unbelievers' and 'sinners'.