Being irrational, like the rest of us.
Humans are irrational beings. We admire impractical things such as art, feel unexplainable things such as love, and keep faith in things we have no proof of. We also find it easier to remember or honor a deceased loved one if we are looking at something that reminds us of them, including their grave. We often respect the dead, who have no feelings, more than we respect the living, who do have feelings. Some Atheists often satisfy the human need for prayer (or submission to a higher power) by talking to themselves, or someone who isn't there, or the universe.
Being irrational doesn't mean we are stupid, though compared to God we are. It just means we are human and imperfect.