There you have it: the elemental fear that belief in evolution will cause morality to collapse. That fear is predicated on a powerful assumption: that morality comes to us from God via religion. This is false. It is demonstrably false.
If religion were God’s UPS, delivering a package of moral laws to humanity, you’d expect a single, consistent set. Yet, each religion includes unique laws that outsiders find baffling or repugnant. Hinduism has its “untouchables.” Buddhism (as understood by many) spurns those born blind or otherwise disabled for bad behavior in past lives. Judaism, Islam, and Christianity each have their oddities: Judaism’s law against mixing meat and dairy, Islam’s prohibition on figurative art, and Christianity’s ritual drinking of Christ’s blood, for example.