I have some disagreements with some religious assumptions; but as bagster once said, (paraphrasing), it doesn’t matter if a being named “Satan” exists or not, but they think he does.
Exactly. You might think it's hokum, but they believe and we should take it seriously.
"The devil may or not exist, but belief is real".
~ Bagster
or....
"The greatest trick the devil ever pulled, was convincing the world he didn't exist".
~ Verbal Kint (aka Kaiser Soze aka George Soros aka Rothschilds aka Deep State aka the True Enemy)