There's a case to be made that their religion has become very ingrained with their day to day lives to the point that it's indistinct from any other type of social organization they have. In that case the faith, religious ideology, and texts are a little secondary to things like their family structures, social infrastructure, support networks, and locations where they can organize. So in that sense their religion has become very material, which is often what happens. Religious belief can often be made very manifest in the world, reified through things like very tight social groups. Islam in much of the world, including Palestine, is as much a political organization as it is the more spiritual side of things.

Although I'd criticize Hakim for characterizing all Palestinians as Muslim, or saying that Islam is the primary thing that's motivating them. Rather, it's more the case that political Islam is the most organized game in town due to historical factors of the region. If it weren't Islam, then people who want liberation would have something else, like how many Irish Republicans are Catholics. It is true though that 98% of Palestinians are Muslim, but that 2% who aren't will probably also want liberation.