Religion can have that effect on people. I knew a Hindu guy who married a Christian. A stormy relationship that led to divorce shortly afterwards. He then became a Jehovah's Witness.

One night down the pub he's pontificating about the perils of gambling to everyone while knocking back the bacardi breezers - then proceeds to drive home

Another time I phoned him up the next day after a night out.
"Who are you? do I know you?" was his reply

Haven't seen or heard of him for about ten years. Came across as quite affable at times then there's the weird side to him which I couldn't understand. Strange fella for sure.