Do you think a religious leader should be involved in gambling?
Though there is no actual place in the bible that talks about religious leaders involving in gambling but the bible made references of how the love of money is the root of all evil 1st Timothy 6vs9-10 and also we cant serves two masters at thesame time either we chose money or chose God (Matt. 6:24). The reasons why religious people should avoid gambling is due to addiction because constancy will Leed to addiction which is not good for a religious leaders you can take a look
here to see what the bible says about the love of money
Do also accept his reason for engaging in gambling? Are these casinos right to ban him from gambling?
Whatever reasons he did such thing is between him and his believe. If you ask me wether it's right for the gambling site to ban him, I will say it is within the Power of the gambling site to take any decisions when they see an unusual wining because the reason for any casino is toake money and not to get into bankruptcy.