You're talking to a 49 year old German.

When I was about 15 or 16, I once naïvely asked my grandmother why noone resisted Hitler. She got very angry, told me I knew nothing about the time, and how much good Hitler had done, and then told me to shut up.

She suddenly turned from this loving person into a stubborn, old, bitter and aggressive woman, showed a side I had never seen of her. So she was a counter example to not one, but two of your claims:

• She was a real believer in fascism, and remained that even decades after the catastrophe fascism had plunged Germany and the world into.
• She emphatically was not pro free speech and would absolutely not tolerate me saying anything against her belief.

And she was a woman who claimed to be of a strong Christian faith. I'm well aware that not all of her circumstances translate 100% to modern day America, however I'm still inclined to think that most American Christian fascists also truly believe in both fascism and Christianity, just like my grandmother did.

In other words, I stand by what I said - "They are not christians" is a no true scotsman fallacy used to try and manufacture a distance between Christianity and fascism that does not exist. These people are both, Christians and fascists, and saying otherwise is a bad attempt to absolve religion.

A religion is defined by the behaviors and beliefs of it's followers, they absolutely are Christians. "Being Christian" just doesn't mean what you want think it does.

Doesn't the Bible say something about only god knowing what's in people's hearts? And that only he can judge?

Sorry that it embarrasses you, but they absolutely are Christians.