"...Define "uncommon"..."
Rather than context-void, meaningless volume counts...
Perhaps we might more profitably look at
ratios, within the domain of domestic violence deaths resulting from beheadings...
The ratio of beheadings committed by Muslims versus those committed by Buddhists...
The ratio of of beheadings committed by Muslims versus those committed by Hindi...
The ratio of beheadings committed by Muslims versus those committed by Christians...
The ratio of beheadings committed by Muslims versus those committed by the UN-religious...
The ratio of beheadings committed by Muslims versus the number committed by
ALL non-Muslims...
combined.
Assuming that credible statistics can be gathered for such purposes from someplace or another...
Wanna guess where the Smart Vegas Money goes, in naming one or the other as Most Likely to be The Winner?
And, in the absence of any such quantifiable data, and relying instead upon popular memory of such occurances over time, it's a fair guess which Belief-System is tagged for that purpose by the Man on the Street, as well...
None of that means that such a perception is 'right'... merely the more likely of the choices... with a high degree of 'probability'...