If a dolphin, a spider and a chimpanzee have the same origin as I do, can my life have any more meaning than these lives have?
Without God, our lives have no objective meaning
Morality would be whatever helps a human or group of humans to survive a little longer...nothing more
Without God, good and evil are just a matter of opinion
If God is perfectly good and never errs, we have our work cut out for us. We could never impress God with our self-pronounced "goodness"