Do you think a religious leader should be involved in gambling? Do also accept his reason for engaging in gambling? Are these casinos right to ban him from gambling?
Every religion have their own belief and rules when it comes to gambling, if that religious leader is spending his own money and its allowed on their religion then why not but the question is, is he using his own money to gamble? Casinos have the right to stop you especially if its affecting the business already and as long as they didn't freeze your winnings, I don't see any issue from this and this is not the first time the casinos stop a gambler from winning more.