Those who want to gambling can continue what they want. That will of course depend on themselves. If they are religious people, they won't gamble. In contrary, those whose faith is still weak will gamble. Religion forbids gambling, but many people in each country still gamble. So it's up to each personal. We can not force them stop gambling, especially the government but we can only advise them against it. The decision is theirs, and we hope they understand the risks and consequences.
I completely agree with you. Every person has the right not only to choose their religion, but also to completely renounce the faith they once accepted if they so desire. Therefore, we are not obliged to obey the wishes of people who preach a certain faith, even if it is the only one in your country. Furthermore, why should I refrain from gambling if I am not causing problems for myself or those around me and am behaving responsibly towards society and my country?