Some Muslims drink alcohol other don't. I'm sure some will gamble and say it's all right by their faith and some will say it's forbidden. There's as many interpretations of religions as there are people.
This is not to open our Muslim's brothers but that is the reality and I saw it also. It is to think that some of them are not following their rules and that is so-called freedom. I believe there is no wrong with that if we never been involved in illegal activities. We don't need to generalize it and think that gambling is bad, it is only our own perceptions that make it bad.
Because if we generalize it, we will be judging people that they are doing the right thing, everyone has their own belief and only God can judge us, when it comes to salvation, we just need to do what is right because we cannot save other people surrounding us.
Further, even in one religion, we might also have different interpretation, just like Christians, they have different religion but they are all believers in God and they don't directly preach that gambling is a sin because this depends on how people will become when they gamble.
