Bad is a religious word.
Um, what? If you're religious, you might see it as a religious word, but it's no more a religious word than knees are Christian because Christians have knees.
If we're just here because we're here, there is no meaning at all. That is to say something might be meaningful to you, but it's not absolutely meaningful. Same with morals.
What's wrong with that? Why can't humans create different meanings? Does this extend to, say, interpretation of art or literature in your mind?
Do you accept that people interpret the same bible passage differently? What is the point of bible study if there's no room for different meanings? Why do we all need to have the same interpretation?
Not having any absolute meaning doesn't equate to having no meaning at all. There can still be meaning; it just isn't absolute.
So if someone finds meaning in causing hurt to others, that is no better or worse than finding meaning in being good to others. Meaning or morals as an an absolute, independent idea, just doesn't exist.
Unless of course there is a Creator.
So what you're saying is that people who believe in a divine creator believe that meaning and morals are absolute, and people who don't might have different moral values and might see things differently?
Is that just a description of how things are? It doesn't prove there's a creator unless you already believe in moral absolutism.