~snip~
I don't think such person are religiously strong to their faith, because you would be surprised what people can do just to uphold their beliefs. In my country where religion is taking seriously people tend to overcome even huge winnings that might influence them into gambling. Although some folks can actually be lured like you said by people winnings and then even become more worse than the actual person they followed.
Each place will be different, and there will be people like that, especially as this may also have something to do with different habits in each place. They do take religion seriously but they also engage in gambling activities and some even admit that they gamble in their free time. And it does happen, but we can say it doesn't exist because we don't know. Some people will gamble excessively so that their lives become worse than other gamblers, but they continue their gambling activities as if the bad things are nothing to them. They are still able to survive, and they still carry out their religious activities regularly.