This is also a reason to let go of perfectionism. We make lots of mistakes. Letting go of our judgment about these, learning, and moving forward allows us to find meaning and purpose.

By the way, being an atheist, IMO, simply means not attaching oneself to the mythologies of religions. One can still be open to the mysteries and wonders of the universe. These do not require our describing them, which only diminishes them. All that is required of us is to participate.