My F was this kind of person. He was a missionary in Africa and always demonstrated a deeply spiritual attitude. He was greatly admired as a brave man who had suffered greatly during the Second World War. (He was a Czech refugee whose family had suffered greatly.). He also suffered from Parkinson's Disease, diagnosed in his early 40s and had several strokes.
But it was all a con. He was a sexual predator who sexually abused my DSis and me; I was 6 when he first raped me. He also did it to some of our school friends. He allowed my DB to be sexually assaulted (he was part of a paedophile network). And groomed him to abuse us.
He pulled the wool over my DM's eyes, made her think he was a wonderful father. Actually, I realise that he was controlling of her, financial abuse. He emotionally abused her and accused her of infidelity regularly.
He's dead so there's no way of asking him how he could justify to himself some of the things he did. He was very damaged, I think he had NPD, as he could never admit to being in the wrong. My DSis told me that he did ask her forgiveness when he was dying, for 'what he put us through when we were children. Obviously he was about to meet his maker, so he was belatedly trying to put things right.
I've known plenty of others like him. The problem is that there still persists the idea that we shouldn't 'bring shame' on to the church by reporting sexual crimes. I've heard it said very recently by a pastor I thought was a decent family man, which deeply angered me. He actually told my friend whose husband had abused her daughter that she shouldn't report it to the police. And also, to cap it all, he told her it was her fault, and not been a good enough wife.
My DM blames herself for not satisfying her H; it's a very persistent belief in the church. Her advice when I was traumatised by horrible flashbacks and couldn't have sex with my DH was to 'lie back and think of England.'