That's a seriously disturbing read. It's curious that he converted to Sikhism; you don't see that very often. It is fairly normal to see Pakistani guys and Indian guys getting lashed up or stoned together. Away from the religious stuff, the Venn diagram does include space for mutual intoxication in the middle. Just goes to show, your assumptions are just that; assumptions.
Muslim attitudes to alcohol are weird. My Girlfriend's family all pretend her little brother doesn't drink, even though they all know he does. He is allowed to keep beer in the fridge but only if it is in a plastic bag so they can't see that it is alcohol. Watching his Mum and Dad speak to him when he is blocked and pretending that he isn't is hilarious.