If there isn't a God and we all got here by a naturalistic big bang, and naturalistic evolution
In what way - whether true or not - do a big bang and evolution negate a god?
then morals are something made up and don't have anything to do with reality. Atheists don't want to believe in fairies in the sky but do want to live with fairytale morals?
Morals are not made up. Many social animals have morals, justice systems and punishments. These are not imaginative animals who make things up, they are merely animal groups who require (presumably) morals the better to succeed as a group.
In my worldview morals came from God, so what I see are atheists that have no foundation for morality living like there is a foundation for morality, like the world was created by my God, and ignoring the fact that their worldview has morals that are made up from imagination and they live like they are real
What you see is what you want to see and what you suggest is that there can be no naturalistic explanation for morals that is satisfactory to you and therefore it must be magic.