If you want to quit from gambling you have to quit completely. If you still feel like gambling, you can not stop gambling. You have to do it totally, if you do it halfway, you'll just spin in a loop without stopping. Do your best or not at all.
He can still stop gambling if he feels like to gamble. There are too many ways to gamble without using your own money, there are play money that he can try or download some gambling apps that requires him no money to gamble.
Why to go for such option that have nothing positive in it. Such people often lose and then they cry over spilt milk. Then they have nothing for their living once indulged in this gambling. Why you are advising pope to get into a hell that doesnt any positive vibe and doesnt has any profit for them. Try to understand, this gambling isnt good for your wealth and health as well.