GOOD AND EVIL
What is good, and what is bad, and evil, have evolved over time. Good, used to mean reciprocation. I give you a gift, you give me back an equal gift, reciprocation, and that is good. I beat you up, you beat me up, reciprocation, and that is good. So what is bad? One who cannot reciprocate is one who is deemed bad. The individual action was not viewed as good, or moral or immoral, it was ones ability to reciprocate.
Those who can reciprocate became the masters, those that can't, the slaves. And from there, the idea of "goodness" and "badness" started to evolve differently for those two different sets of folk ultimately becoming what Nietzsche coined as The Slave-Master Moralities.
So right away we can see that the idea of good and evil is subjective as it is different for two different kinds of ppl.
With Judiasm, the crutch of the masses, the book that says the slave is good, a certain morality has become commonplace in our society. The master morality will always exist, they will always rule the world, but these days they must justify their actions in a world that is defined by JudeoChristian slave morality.
Neitzsche was able to put certain traits into the slave and master moralities.
MASTER: Focused on strength, power, ambition, growth, excellence and its pursuit.
SLAVE: Focused on the weak, sick, poor, disavows power, calls it immoral, concerned with fairness and equality.
Nietzsche thought that the Christian world view was that of the slave and the slave morality will always only be good long as they have the masters to compare themselves to but at the same time they want to do away with the masters, an inherent irony and conflict, which is why they don't thrive in life.
Things are only evil in the Christian world view because they're qualities the slave lacks and the master has.
So Christianity is the codfied philosophy of the slave. This was Nietzsche's issue with western religion. He felt to truly affirm life, man must affirm ALL LIFE