Yes they do. Even Trump has supported increasing Christian refugees. Although religion is far from the only important factor to Western culture.

>Also they are constantly talking about saving the german/north european culture/people. This is more about race and racism than anything else.

I fail to see how wanting to preserve your race is racism. I like my own people and want to see them continue. It doesn't mean I literally hate and oppose other peoples.

And I really do think you underestimate the cultural aspect of it. If they were brown skinned but otherwise culturally indistinguishable from Europeans, I think far fewer people would care. Labeling your opponents "racists" is just a convenient way of dismissing their concerns.

>Its obviously true that there is a scientific base to racial questions but discussions about it are rarely based on scientific research.

That's more of an issue that average people don't know how to do scientific research or think scientifically. I think they intuitively see things like "hey this group of people seems to do way worse" and "the mainstream oppression narrative doesn't really make sense." Without having the knowledge to dig up the actual statistics and figures to prove that.