The figure seems to be greatly exaggerated. The Holocaust page on Wikipedia lists the total deaths of that event as in the range of 8 million, and there's no mention of Catholics on the list either, so they're probably grouped into one of the small categories with others.
I found no mention of Catholics being killed en masse by the Nazis beyond a couple cases of priests in concentration camps, the largest number of those being 2,500. Surely they weren't free from persecution and I'm sure many thousands perished, but the numbers don't compare to those of the Jewish victims.
I found no mention of Catholics being killed en masse by the Nazis beyond a couple cases of priests in concentration camps, the largest number of those being 2,500. Surely they weren't free from persecution and I'm sure many thousands perished, but the numbers don't compare to those of the Jewish victims.