When Trump, Fox News and McCaul start referring to Robert Dear as a radical Christian who is part of

[MisterP]

2. right--it was latae sententiae excommunication to join the IRA: the very moment your active mind

made a conscious decision to join it (didn't even have to be informed decision) any Sacraments you took were illicit heck, its leaders were hardbitten atheist Leninists
Boko Haram/IS in fact is defined by a doctrine of completely ignoring the ulema and making your own interpretations (and isn't that what American experts and Mideastern exiles and New Atheists and Eustonites were demanding for a decade? too bad they forgot what happened in the Protestant Reformation); even in Paris/Berlin the IS murderers were aficionados of pork, spent Fridays in very un-mosque-like activities, and basically lived in a haze of weed and ethanol
what happens in both cases is that "Catholic" or "Muslim" are boiled down to pure identity, which can be as vacuous as it likes--because if there were any criteria involved you have a zealot who makes their own choices, not a perfect gunman to strike a blow at a phantom foe