Hardly surprising to most ... but it's interesting to have a study confirm it.
As you say, hardly surprising to anyone who has experienced it first hand.
It doesn't take a medical genious to work out that a child raised to believe that if they are naughty they will be punished by eternal damnation in either a burning hell or having the ground open up to swallow not only them but also their pet dog or cat at armageddon (which is coming sooooon), is more than likely to suffer some kind of mental anxiety as they grow up .
However, they have probably spent obscene amounts of money researching the subject and at least it confirms what should be glaringly obvious to most people .