Agnostics most probably raise their children as agnostics just as Muslims raise their kids as Muslims. All reverts/converts who did it sincerely are practicing Muslims I believe.
Next, I can't speak for the world but in my original birth place, Pakistan, Muslims are very devout. However, I would assume most people listen to music but as I said in one my earlier post not all scholars conclude that music to be haram/forbidden. As for alcohol, it's forbidden and therefore not even sold except to licensed dealers who can only sell to non-Muslims and can only be found in big cities. Gambling is also forbidden and no casinos can be found Mostly the societies are conservative. This would be also true for most of the Islamic Countries. I can't speak for the Muslims in non-Muslims countries.