but Christian conscience tells me a scientific thesis like "black people tend to be less intelligent" would be wrong.
Okay, I'll bite.
Let me ask you this, Rott: at what point does an honest scientific study into the physiological differences between the races degenerate into the "scientific racism" you're talking about?
Example: They have proven that people of African descent have more "efficient" metabolisms; that is, less heat is produced by their metabolic process, because historically they came from a warmer climate and as such did not need the extra body heat. They also tend to be taller and heavier than most Caucasians (this is less universal but still applicable) Someone ruminated that this is why there are so many black athletes in high-energy sports like basketball and football.
Now, that's a fairly neutral and logical conclusion to draw. It could, however, be twisted into "black people are good at sports" or further into "black people are only good for physical things, like sports and hard labor, and here's the scientific proof".
At what point does racism start to enter into it?
IMO, this is why more studies about genetic differences between the races aren't done.