Have you ever prayed before placing a bet (gambling)?
Did it work?
I pray a lot and I'm also praying when placing a bet or rolling a dice, it doesn't matter if I win or not the most important is I am putting faith in my belief and the almighty, you can pray in any situation any place and any condition, it's beneficial in both body and mind and I don't see anything wrong why you should pray when gambling.
You shouldn't do that because it's dangerous, it implicitly convinces you that you have an influence on the outcome of the game and tends to encourage you to make irresponsible bets. You should be more careful about your actual probabilities and your bankroll management instead otherwise you can get big losses unfortunately.