I have noticed that the majority of people in here who claim to be atheists are not really atheists.

You're probably right in that their expressed reasons are not genuine. Whenever I hear and atheist justify his position, it's always the same thing: the Bible has contradictions, the Bible supports slavery, the Bible condones rape... But most of the time, they don't even know where it says these things. So all we can really know about why they are atheists is that it's something they don't want to reveal