"Demons can come inside a Catholic Church"

1.  Demonized man disrupts live EWTN Mass with Fr Wade Menezes - https://www.patheos.com/blogs/deaconsbench/2018/11/shock-screaming-man-d...

2.  Exorcists And Demons Clash In A Supernatural Showdown For The Fate Of Souls https://dailycaller.com/2018/10/28/how-exorcisms-work