Technically the Jews were persecuted by the Nazis because of their Ethnicity, not their religion. Same was true for the Poles and the Gypsies. Millions and millions and millions.
In contrast, very few of the other groups were actually affected. There weren't but about 250,000 witnesses worldwide in the 1940's, so in Germany I would think the number quite small.
I recently saw an HBO special on homosexual survivors of the holocaust and I believe the number was around 15,000 or 20,000 and many of these were singled out because of their political affiliations even though they wore the pink triangle.
What angers me more about coverage of the holocaust is the fact that you always hear 6,000,000 Jews, but not about the other 9,000,000 Poles, Gypsies and other ethnic groups that were singled out. Of course, our ally Russia was killing 30,000,000 at the same time.
The other thing that disturbs me is how people think the Germans didn't know what was going on in the concentration camps. I doubt that seriously. Thousands of people with families worked in those camps and ran those ovens. Watch Judgement at Nurembourg, astonishingly provacative film on what feelings were behind the Nazis.
hugs
Joel