I can’t speak from the religious perspective,but just from a “human perspective” some reasons why psychics are wrong is cause they sometimes decieve,cause confusion,rip people off etc.
I used to use psychics when i was younger and desperate for help.
One big issue is,psychics get paid huge fees.Look at the psychics on the webiste
www.liveperson.com for example.
Which other occupation gets to charge $15 bucks a minute

?
I think thats about $900 an hour-is that correct?
So,its often desperate people turn to these and get exploited.
Another thing is,when they get it wrong they always say “this persons negative energy was blocking me”
In other words-they blame the customer for their “failures” which is deception,or in some instance they even lie,can confuse already vulnerable people etc.
Another point is how does the person not know that the psychic isn’t lying to them?
They might not be communicating with anything at all but just be making it up.
Even if they are communicating,how does the person know that these spirits arn’t lying,causing deception etc.
I could be wrong,but i don’t think all “psychics” are evil and genuinly wish to cause harm,but i do think they are deluded/misguided.
Even if some psychic could “get it right” i guess it still doesn’t make it morally right though?
That said,has any psychic ever got it right?
I don’t think so because like the old question goes,why arn’t psychics predicting lotteries and becoming millionaires.
They’ve always got some excuse for that question too.

Thehy always ask for your photo or some other details too.
In my bias opinion,its better off asking friends for advice then these psychics.
That was a bit ranty,sorry.