In recent years, some Christians have been deeply offended by modern "art" that pictures Jesus's face on the lid of a "toilet altar." That has a Crucifix immersed in urine or offers a picture of the Virgin Mary smeared with elephant dung. Some see such images as a blasphemous affront to faith and an attack on believers. But the American and British artists who produced these images were free to put them on display, and they have been widely reproduced. Freedom of expression in Canada and other democracies is a cherished, fundamental right. And being free, means being free to...