the problem with religious ppl is they think bad moral is = evil= devil . i dont call it devil ( devil is a religious term )..i call it human bad morality .
for example : when an animal kills another animal . we dont use the word murder .
Answer so simple: That's why they are called animal!
But when human killed one another, there are at least (in English legal terms) over a dozen terms to describe the what is 'killing', depending it's nature - murder, infanticide, suicide, culpable homicide, genocide, etc......These distinguishes human from animals. Animals don't murder...they just kill and it's their instinct to do so - at least for many animals in the wild - because these wild animals need to survive, and for them, the only way to survive is to kill another animal for food.
Sadly, human has regressed to this point....though we don't kill another human for food, but through our evilness and wickedness, many people committed sucide because they were cheated by others of their life-savings, killed by others just to rob them, etc.