On the best view, justice is fairness. - A. C. Grayling

People not only live by symbols, but die by them, as wars of religion and nationalism attest.

Emancipation is always at risk from the usual sources—demagogues, civil and international war, the tenure that superstitions have over the human imagination—so there are no guarantees that progress will continue.

None of the major faiths is bloodless; history reeks with the gore of their wars and persecutions, all the more disgusting a spectacle for being, in essence, as simple as this: A kills B because B does not agree with A that there are fairies at the bottom of the garden.
People should be left to believe what they like, so long as they harm no one else. Apart from normal expectations of politeness, it is not however clear why people should require their personal beliefs to be treated with special sensitivity by others, to the point that if others fail to tip-toe respectfully around them they will start throwing bombs. From a secular point of view, religious beliefs are at best absurd and at worse dangerous, and the amount of free play they are given in the public domain is a menace. Believed-in fairies should be kept at home as an entirely private matter, and their votaries encouraged to cease taking themselves so seriously that, when irritated by those who differ, they resort to Kalashnikovs. Apart from anything else, such reactions speak little confidence in their own violently-held certainties.