The funny thing is that many gamblers blamed everything when they made mistakes. They always find an excuse for their wrongdoing, and the sad thing is, they even include religion. Addiction is not completely related to any belief but rather is a personal choice. Indeed, it was more than that but some kind of mental problem.
I think the saying is right: a gambler never makes mistakes once, but several times. That is why we become addicted due to our wrong approaches and behavior. Which is why we don't have a reason to blame others besides ourselves.
You are right, addiction and mistakes in gambling are done by themselves, it does not need to be associated with someone's religion. If they believe in a religion that forbids them to gamble, why do they still gamble? From that choice, they are already wrong, then when they make a mistake while gambling, they blame others. That is very wrong. The gambler is the one who does and takes the risk of his own gambling. They must learn to accept reality.