Religions is about their own belief, and they have their own rules with regards to this one but technically, gambling is just a human innovation and I don't see any connection with the religion there. Some people think gambler is bad because they are playing for money, and they idolize money that much while others don't really see as a bad one in fact many gambler sees gambling as their opportunity to make money, and that is a different story to tell. I respect every religions, if its not ok for you to gamble then let's respect each other, after all we are just human and we all want to do whatever we makes us happy.