this is a completely unrealistic civic, if a real civilization opted for it, it would be conquered and assimileted by another, and thus it is not an important civilization, and most of them we probably dont even know about.
Along all this thread, you all have been misunderstanding pacifism. Pacifist nations aren't those who lack completely of military, because there's no one, and there hasn't been no one, like this. Pacifist nations were those who have legal or moral restrictions, based on religion, that asks military to have a purely defensive purpouse. That doesn't mean, also, that pacifist states are forbidden to enter in war, even for offensive purpouses. But this generates economic inefficiencies, which are reflected in the game by raising the military mantaining costs.
In these sense, we have several examples. I've said them before, but, please forgive me, I'll repeat them:
-Iroquois, before American's expansion to the west.
-Modern Germany, Japan and Switzerland (OK, these one are not based in religion, but I have already asked for pacifism not needing SR).
-India, during Mughals' rule, and Gandhi's and Nehru's dinasties on power.