Theres a guy Who's a heavy drinker,Or Partys too much Or is just generally in a bad state in their Life and Suddenly they Turn To religion and turn their lives around and Start acting Holier than Thou.....and they'll generally state how they've "Found god"
Any port in the storm.
But seriously, sometimes when people have ended up in a circle of substance abuse or any kind of really destructive habit they see the proverbial writing on the wall. The realize that if they don't make radical changes their lives will never improve.
Imagine being the alcoholic who is near giving up on life. Imagine thinking that every choice you've ever made has steered you towards where you are now.
How could you trust your own independent judgement?
I can only imagine this is part of the explanation.
When you're trying to kick a bad habit you always need a substitute. After a life of highs or drinking binges you've probably seen some amazing things. Gnomes riding vacuumcleaners, talking dogs, seven fingers on your hand, you name it. Drugs can do that.
So maybe the leap from drug induced feverdreams to fevered zealotry isn't that great...