@Hasan Prishtina
The USSR and the Warsaw Pact example is kind of invalid because while atheism was indeed claimed to be an essential part of the state ideology (there was even a compulsory course for higher education students called 'scientific atheism'), the population wasn't exactly atheistic. There was in fact a state 'religion' - the Communistic ideology. If you look closely at Communistic ideology and how it was applied you'll see many similiarities with the Church ('gods', 'prophets', prophecies, martyrs, holy books, preaching, fundies). Moreover, in many aspects this new ideology just plain replaced Orthodox Christianity after 1917.
Soviet version of atheism was not so much actual atheism but rather a cleverly disguised "thou shalt not have gods before me" commandment.
The only true atheists in the USSR were those who were both atheist and sceptical about communist ideology. Such were all the people capable of critical thought (a minority in most countries as it seems). And by 'coinsedence' many high-ranking officials were just like that (you don't have to actually believe in a religion you create and control youself).
And also there was third and propbably the largest part of the population: mild 'believers'. The people that didn't care much about the ideology and followed it just out of conformity. In general such people don't hold onto their beliefs much and switch ideology/religion without a second thought if persuaded to do so. Just as it happened in 1917 when general population abandoned Orthodox Church and in 1989-91 when Communist party lost it's ideological power (and you know what, it hadn't taken long before the Church came back swiftly to reclaim it's flock).
I myself can't name a single country in the present or in the past with a majority of atheistic population. Whichever country you take there is some kind of a generally-accepted system of religious or quasi-religious (such as state ideology) beliefs.
P.S. to sum it up, I'd say that in the eyes of an atheist 'secular' totalitarian ideologies (state ideologies) need to be generally equated with religions as they share many principal aspects. Totalitarian ideologies are basically modernized religions. You don't have to believe in an ostensively supernatural power (such as the Lord) any more but you still have to believe in 'god(s)' and a lot of dogmas. You still have to believe that there are people who 'know better good' for no apparent reason (essentially the reasoning for their supermacy is as supernatural as with conventional gods). Plain and simple the similiarity between a 'secular' totalitarian ideology and religion is that they both oppose critical thought and require blind belief.
