Franco wasn't anti-religious. Neither was Hitler. Nor Castro. Nor any of the dictators in the African countries. We've had lots and lots of dictators and totalitarian regimes, few of which were anti-religious.
Also, Mao Zedong was anti-religious, and is estimated to have killed between 40M and 70M.
> Nor any of the dictators in the African countries.
Well, yes, there are horrific genocides and mass murders and atrocities in Africa supposedly in the name of religion.
I agree that evil is done by both atheists and believers.
And gizmo is right, there have been brutal dictators who use religion as a cudgel, and there have been those who haven't.
So while Santorum himself is unlikely to bring on religious-based executions even if he did become president, a vote for him is a vote that the country continue down this frightening and destructive path. Stay on that path long enough, and eventually we end up where Iran is now.