I don't expect you to believe in spirits or believe that anyone has seen them because you're an atheist, Christine. That goes without saying. Despite the lingering skepticism, it is becoming more widely accepted and common in today's society to acknowledge the reality of ghosts and other paranormal phenomena. As denoted in the articles, the negative stigma associated with belief in the paranormal has declined significantly in the past 23 years.
According to a survey from October 2021, 63 percent of its participants (2,000 people aged 21 and over) believe in the paranormal in some form. The people surveyed said the most common unexplained beings they believe exist include ghosts (57%), aliens (39%), and Bigfoot (27%). A third (35%) of the people surveyed said they have felt an unexplained presence in their home, prompting them to believe that they are being haunted. Here is a link to the survey: "Paranormal Nation: Nearly two-thirds of Americans believe in ghosts or aliens." FYI, every year on May 3rd, there is a day set aside for those who believe in paranormal phenomena. It's known as National Paranormal Day. I've participated in it by conducting a paranormal investigation on that day.
Gallup Poll: One Third of Americans Believe in Ghosts (2000)
Americans' Belief in Psychic and Paranormal Phenomena Is up Over Last Decade (2001)
Three in Four Americans Believe in Paranormal (2005)
Brilliant Scientists Are Open-Minded about Paranormal Stuff, So Why Not You? (2012)
Spooky Number Of Americans Believe In Ghosts (2013; updated 2017)
Pew Research Center: 18% of Americans say they’ve seen a ghost (2015)
Paranormal America 2017 Chapman University Survey of American Fears (2017)
Paranormal America 2018 Chapman University Survey of American Fears (2018)
You Gov America: Many Americans believe ghosts and demons exist (2019)
Reports Of Paranormal Activity On The Rise During Coronavirus Stay-At-Home Orders (2020)
57 Percent of Americans Believe in Ghosts — and Many Think There's Paranormal Activity in Their Home (2021)
You Gov America: Two-thirds of Americans say they've had a paranormal encounter (2022)
Many Americans report interacting with dead relatives in dreams or other ways (2023)
You are welcome to your beliefs as is everyone else.
And i can provide just as many links to contradict your flood but i won't bother