killing is a bad thing to do?
Morals and ethics have nothing to do with religion.There is nothing like absolutely morality.Morality is relative concept.
But as a human society we have set some norms, and killing is evil for us. But again there is nothing like evil.
we as humans, set our own rules and norms, we don't need old text books to teach us living codes.Killing people have bad consequences, you might face jail or death punishment.
But I admire religions, they helped build societies on some level of moralities,But at the same time condemning sex is very damaging for any individual. So religions do have merits and demerits.