Recent history teaches us that secular societies that substitute the state for God as the source of rights almost always ends with the majority slaughtering the minority, eg. Josef Stalin, Pol Pot and Chairman Mao.
Actually, your examples prove my point. A dominant philosophy was accepted by the state as the legitimate "Truth" and the majority began to kill the minority. Religion (or Philosophy) and Politics don't mix. There is nothing special about Christianity, Islam, or Buddhism that prevents them from being used and abused in the same way as they have, in fact, been.