It's sarcasm. I just find irony in those champion Christian ideology and pretend those involved in the genocide and theft of land from the natives weren't Christian and it didn't happen. Those people who did that, definitely weren't living with the golden rule in mind. They were greedy and selfish. And upon that, their religion shines. You can see it on every corner in this great state. The religion and ideology of complete and total love... Just don't ask them how they got it to where it is today.
I think you are making assumptions there to prove a point. No one is pretending that atrocities and genocide didn't happen by people professing to be Christians. It has happens throughout history on many levels. Those atrocities are clearly contrary to Christ's own words and the men that committed such will be judged.
My point is that there are millions upon millions of Christians that have worked and died (some at the hands of the previously mentioned) to improve this planet in ways no one will be able to comprehend. But that doesn't fit the atheist argument. Sorta like blaming the NRA for violent crimes. The real members get blamed for the things non-members do.
If I may ask, why all the passion for being against something that so many are equally passionate about?