One thing I know is that religion will never determine what I do and what I do not do, most especially if it concerns my personal happiness and all, gambling is not a bad thing per say, but how we approach it is what matters alot.
Personally, no matter how dominant or dominating a particular religion is in a country, I don't think on their own that have the constitutional right to ban gambling in such a country since this could simply mean imposing their own law upon members of other religions forcefully.

The only agency which such right is the government, if the government decides to ban gambling, then that's it, in a country where there are multiple religions, each religion can impose laws only on those who are members of that religion, and on this adhering is based on personal choices and so on. But when the government of a country creates a law, every body from every religion is expected to adhere and obey that law.