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If so many Christians were so easily swayed by hateful propaganda then that's still a fault and failure of the religion, as is the utter failure of the "good" Christians to do anything about it. People aren't machines that blindly process inputs into outputs, at least not in any useful sense that takes morality and ethics into account. People have agency, they're responsible for their own decisions. And these people have a Bible probably at arms reach at all times and they know what it says.
Christianity itself really has little to do with it. I think it's more so that "Christian" is just the default cultural identity and worldview of native born Americans who have zero self awareness, thoughtfulness, or perspective on the world. Almost none of them actually believe anything really when you start to ask questions about it. It's just the in-group that they latch on to because they've never had an independent thought in their lives.