Possession is rare. Obsession, where an evil spirit influences one’s thoughts is not all that rare. Fr. Ripperger estimates 20% of the US population suffers from obsession.
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While I agree that people should not focus too much on demonic activity and there is no reason to attribute every unexplained event to such activity, I think it is important for people to be well informed on this topic.
There is a significant question whether Fr. Ripperger (and Fr. Amorth) have actually caused people to be “well informed”.
On the plus side, I have occasionally watched/ listened to/ read useful material by Fr. Ripperger on various subjects of Church teaching where he did not deviate from the orthodox teachings, and I have sometimes prayed the Auxiliorum Christianorum prayers.
On the minus side, he is also known for injecting a good bit of his own opinion into his discussions, and his opinion does not always express the view of the Church (for example, his opinions on women working outside the home). His main focus is the area of deliverance, spiritual warfare and exorcism, he runs an order focusing on this charism, and if your main tool is a hammer, then everything tends to look like a nail. The passage you quote is his own “estimate.” Based on what, who knows? Fr. Amorth similarly raised eyebrows with his estimates of things like how many exorcisms he personally had performed.
In an era when many if not most dioceses have their own exorcists, and there are a number of dioceses with orthodox, traditional bishops, one would expect that information people need to know about exorcism would come from these bishops, dioceses, and exorcists. And indeed sometimes there are feature stories in the news from a diocesan exorcist who is not much in the public eye but is speaking for one feature story; I find this information more interesting and credible because those priests are not trying to make demonic issues into their personal cottage industry within the Catholic community. One also wonders if many bishops and exorcists limit the amount of information shared because they realize people can be very suggestible and wish to avoid that pitfall.
The devil’s best trick is to convince people he doesn’t exist.
As I said in my last post, it’s quite possible for one to be convinced that the devil exists and that he does harm in the world, such as by tempting people to commit serious sins and by fomenting hate, division and anxiety - while one still takes some of the demonic paranormal focus with a grain of salt.