If the country where you live isn't included in the banned list of the particular gambling site, you should have no issues accessing that site. However, since you mentioned that there are some religious concerns on gambling and it is very much possible that the government had ban those domain names. If this is the case, switching the ISP will not help either because it's banned on the country level. The only way to access those sites is via VPN.
Of course, VPN is a wonderful invention that helps many users in different countries.
Especially in countries where censorship is strong. However, this censorship does not sleep and improves the methods of its work. In some countries, blocking vpn services themselves is practiced.
And if you were able to use your favorite vpn service and everything was fine, then there may be such a moment that you will not get access to it.
According to the decision of the regulators of this country, it will be blocked. And you have to look for another vpn.
It is especially offensive if you paid for the service, and the service is blocked.