I think as humans we definitely ‘fill-up’ our lives with activities or stuff in order to try and make life meaningful for each of us. So getting rid of man’s biggest delusion may open a lot of time to be as delusional about other things; hopefully the critical decision making that lead to reject theism will also be used in other aspects of the individuals life leading to an increasingly positive cycle of events to evolve.

Shedding delusions is a process. You might shed your belief in god, but often most people are still plagued by dogmatic beliefs they were taught while they did believe in god. It takes years, and possibly a lifetime to rid oneself completely of all dysfunctional and false beliefs

Sometimes I think that everyone has approximately the same amount of superstition in them but it takes different forms.

Those who take call at hospitals, something that I did for years, have all sorts of superstitious ideas on how to avoid getting called back to the hospital. I don't think that thinking agnostics/atheists are necessarily less superstitious than religious people are.

Atheists lack a belief in a god or gods.That's all. Everything else is up for grabs.
They can have as many nutty ideas as anyone else.
I try to be as skeptical as I can, but even I can miss one now and then.
IKR?

I think more so than believers, but certainly not totally. I have known non believers who believe in conspiracy theories, aliens, homeopathy, and the paranormal. I think most of us apply logic to other aspects of our lives besides a god belief, but sadly, not all of us.