There is a difference between atheists and agnostics. Also agnosticism can NOT be considered as the type of atheism. They are different things. If we approach the problem from the fuzzy logic, it will be much more difficult to define if the certain person is atheist or agnostic (and even theist). There are people who consider themselves atheists, but believe that the world created by God (but they do accept religious approach). So, in my opinion the questions: who is agnostic or atheist - will never find answer. For example, Einstein is considered atheist, but he believed in God which creates new type atheists.