I think this is too one sided, there were both Catholics and protestants killed by both sides.
The civil war in a big part was brought on by the corruption of the Catholic Church, and they were bold because they knew that they would have Hitler and the other socialist leaders on their side.
It is a sad situation when Christians kill each other for the sake of religion, but even worse when both sides are being used by the anti god socialists.
Its a story about the murder of nuns. I'm not sure what the other side to the story would be.
This is actually a minor incident. There were several major massacres committed against the church during the Spanish Civil War.
Of course, when the so-called "republicans" weren't busy shooting nuns, they were shooting each other. I think its fairly clear they spent more energy killing each other than they did fighting Franco.
Orwell wrote a pretty good book about his experiences. He was with the "republicans" and he barely made it out alive when they decided he wasn't sufficiently reliable.
The "Republicans" whom Franco routed were communists and misguided anarchists and nihilists and all purpose criminals, thieves, rapists and murderers.
To accuse Protestants of perpetrating the evils of the Spanish Stalinist "Republican" government and its criminals would be a grave disservice and injustice to decent Reformed Christians of all faiths anywhere and everywhere.
Neither the communists nor the misguided anarchists of the Spanish "Republicans" believed in God at all much less in Jesus Christ and the Holy Scriptures as all Protestants worthy of the name would do.
If every government leader in the 20th century had possessed the wisdom and resolve of Francisco Franco, we would be living in a far more ideal and humane world today.
So, since they weren't even there, how would Protestants factor into it ...?
Similar issue: just last year, Roger Ebert panned "For Greater Glory" (a movie about the Mexican Cristero War) on the grounds that it centered too much on the Catholic experience. (Might that have been because the Cristeros were about 99.5% Catholic, I wonder?)
Ebert said the movie should have included all religions under the banner of religious liberty. Scratching my head: did they need to shoehorn in Moonie, Methodist and Muslim cameo characters? Maybe a Unitarian-Baha'i-Lutheran love triangle, set in the exotic bullet-pocked streets of Jalisco?
Ay, Caramba.