> Crusades, the Spanish Inquisition, Salem witch trials, and the KKK
They weren't mistakes at the time and you're talking about No True Christian now. I do not care one bit if you, in 2014, consider them mistakes or atrocities. The fact is, back then, Christians - including top tier Christian philosophers, Popes, and various people who lived by the Bible, created justifications for such slaughter. "God told me so", therefore it's not murder. Heck, it's immoral to disobey. To ignore the bloody past of your religion is to once again desecrate the memory of too many victims in your "holy cause" of ever loving religion, under the watchful eye of your ever loving, merciful God.
> We all recognize those were horrific mistakes.
Why wouldn't you say that your religion has zero authority on any moral judgment considering the past crimes of your religion? Luke 19:27 might be one. However, I'm under the impression that the OT is also part of Christianity. Same God, after all and Christians often tell me God doesn't change.
> There are forces of nature that are unbreakable. Physics, chemistry, biology. You know what I'm talking about.
I know what you're talking about but you're not seeing my point: some things, perhaps all things, have exceptions and rules could be bent, if not broken. I don't believe it's a good comparison to use reality and our sciences to the unverified beliefs about God.