You can say the same about any religion. Christianity spans much more than "American Christianity". Lemmy is a place for people of the whole world is it not? You can't refer to Christianity as a whole when talking about a very specific brand of it.
I would have thought Lemmy would not discriminate based on nationality, race, creed or religion, but I see such hate towards religion in general (here) that, honestly, you are not being respectful to others' beliefs. Is this what we want Lemmy to be?