Exorcism is a load of shit, but spirits are certainly real, I base this on the events that happened during the nights at my mother's old home (story time!)
for those curious, my mother's old home was old itself, and creepy shit happened at night, namely with the doors, every single one is dead bolted, and locked each night, and at around 3-4 AM (and I've seen the shit on the surveillance footage ) the dead bolt on one door slowly slide out and the locks on the doors turn open, and by morning every single door has it's dead bolt off, and every single door on the inside of the house is opened slightly.
next is on the topic of the second floor, so when my mother had my older sister, she was dicking around upstairs when she was like 3 while my mum was down cooking supper when she hears a door slam and my sister begins crying. my mum tries to go upstairs (dad was with her as well) and she was physically pushed back every time she reached the 3rd step, my dad tries and the same shit happens. my sister bolts down stairs and was cying about a scary woman with a rope around her throat trying to get her.
soon after, my mum was assaulted by a cereal bowl that was launched at her from the counter.
2 years pass, no real activity to note, and I am born, whatever the fuck was holding them back had completely claimed the 2nd floor, there was no way up because you were being pushed on every time you got to the stairs. my family noped the fuck out. the place burned down 5 years later, and the case was never solved because there was no evidence.
How do Atheists Explain an Exorcism?