First, please note the conjunction AND.
While I should not want to be excessively peevish, let me note Pakistan is not and Arab country in any way shape or form and so can not go to answering the question re Arabs.
Even as Muslims it is rather distinguishable from the Arab world, so generalizations there are a bit off to start.
Now, first to those posting “I am sure the average X is just like me” let me point you to my thread in the Great Debates. I hope it will be instructive. On a certain human level that is very true, but the customs and the like are far, far different.
Now, as to religiousity. First, Arabs, Muslim and Xian tend to be rather more religious than Westerners, although when one brings Americans into the mix this becomes a bit of a closer call.
Many expressions, such as incha’allah and the like are pure custom and do not in any way denote religiousity. I pepper my speech, even in English now, with incha’allah, although I do not believe that any god intervenes in a daily sort of way in life. Habit. Similarly other expressions that when translated sound quite religious do not necessarily maintain a very religious connotation. This is more true in the Arab world than in the Muslim world ex-Arab territories where one can have recourse to the native idiom sometimes instead of an Arabic expression.
I will further add that if one knows the origins of any number of Latin lang. polite expressions, one would recieve a similar impression of religiousity - I do not believe that Islamic society is all that unique as some commentators would have it. Certainly plenty of people do plenty of things without recourse to the Quran per se.
The best answer I can give in the end is then (a) I would venture that on average the Arab world (and the developing world, Xian or Muslim) is more religiously observant than the developed world. Easily understood if you think of what people put up with. (b) it is easy to recieve an exagerated idea on the degree due to cultural habits.
I’ll add I have know many agnostics but no athiests in my time in the region. Copping to being a doubter on religion and its tenants is not that bad, eccentric but not that bad; copping to not believing in a God is apostasy in the view of BOTH Xians and Muslims.
There you have it.