No argument there.
The problem with the argument is that the Athiestic viewpoint is indeed just as fantastical as the Thiestic viewpoint. It's basically switching out "Yahweh" with "Chance".
It basically comes down to which God you believe in and how you define God.
In my reading, a definition of God that is "caused everything, exists onto itself, is in all places at all times, and completely miraculous" is the definition that best describes our universe and what we know about the Big Bang. I'm happy to hear other definitions, but let's not pretend the fact that anything exists at all is totally mundane and explicable.
I would find it hard to believe someone was being genuine if they said they reject the concept of God. Now for Christianity, I can see why people would refuse to believe that God came down to Earth in human form. And then they... washed feat and performed miracles. And the people then crucified the Son of God. But then that Son forgave them. Why would God let that happen and why so much forgiveness? And if that did happen, what would that mean?
The universe won’t damn you to an eternity of suffering if you don’t live by some standard. That’s a pretty big difference from any biblical definition.