However, people still gamble for various reasons.
We can assume that the people who still gamble are not from the religion that prohibits it or if they are they are not very religious.
I do not expect anyone to openly here discuss how they participate in something that is expressly prohibited by their religion.
Christianity does rule against gambling yet I do gamble and that doesn't make me a lesser christian than others. What I believe is that religions kicks against certain social activities due to how it has had a negative influence or results in the lives of people in the past, and to prevent their religious faithful from involving in those activities they have to hate it as they do the devil.
Certain religious prohibition is as a way to help the weak in faith and spirit amongst the religious faithful not to go astray as they might not be capable and well disciplined to maintain moderation getting involved in those activities, hence the prohibition.
There are devoted Christians and Muslims that do gamble despite how much their religion prohibits it, you see them applying core discipline to it, and their lives tend to be more pleasing than even those that claim not to gamble because their religion frown at it. Same people that don't gamble still do take alcohol for the stomach sake.