It's not just about gambling, is it? Question is if religion should speak for any activity for the whole country.
As an atheist, i wouldn't want to live under laws that are designed for one specific religion, no matter what that religion is. And it would be really easy to argue how someone's random religion shouldn't harm me, but in the end it all comes to values and what kind of values that region wants to share.
If majority of them don't need other reasoning then how they feel about something, then laws don't always make sense. Because it's hard to argue what laws should or should not do in any logical sense, when those laws have been based on something that denies logical reasoning and scientific method. Yet they are adopted by majority.