This is known as the No True Scotsman Defense, and basically states that Christians never molest children because anyone who molests children cannot be Christian, therefore Christians never molest children. It's circular reasoning.
Good, as I said, comes from the desire not to be the victim of evil. It comes from the understanding that if we all agree not to hurt each other, things will go better. That's why cultures that never heard of Jesus still had laws about not hurting each other.
And your concept of good and evil from from where?
You are arguing as if the Judeo-Christian system of morals is a given.
It’s not. Not all cultures adhere to it. Look up the Sawi tribe and their head hunting and culture of betrayal.