A religion so cheerless, a philosophy so sorrowful, could never have succeeded with the masses of mankind if presented only as a system of metaphysics. Buddhism owed its success to its catholic spirit and its beautiful morality. ↗
If you take a look at history, you will find that the understanding of what is good and evil has always existed before the individual religions. The religions were only invented by people afterwards, in order to express this idea. ↗