Why most professed atheists are really agnostics, is that they really are confused about who and what to believe, but not because God made it confusing, but because they chose to not accept the obvious evidences of His reality through the very creation that is all around us.
Instead of worshiping God, whom they have rejected, they have replaced God with cars, money, job stature, self, intellect, education, hobbies, noteriety(popularity), external beauty/handsomeness, homes, possessions.. etc. These before-mentioned things are not evil in and of themselves, but it's what agnostic man does with them, or how agnostic man views them. Agnostic man has made sense of his universe by creating his own little library of gods.........they are all convenient, they're not convicting to his soul, but they do get boring and must be constantly upgraded or replaced.