| There are a lot of things wrong with your argument. First, we know from vast and varying experiences that people can and do claim that they are something that they really are not. I can claim to speak Japanese, even though I can barely count to kyuu (9). A lot of people on American Idol think they can sing, but the entirety of America is of a far different opinion. So why do you have trouble wrapping your mind around the idea that some people that call themselves Christian probably aren't?
Second, you buy into this idea of a "minimum standard". You seem to think (along with many Christians, I might add) that there is just some minimum that you have to accomplish to get a passing grade in life and then you can sit and do sudoku until you die. Being a Christian isn't supposed to be like that. It is about a lifestyle that you get up every day and try your hardest to live out to the best of your ability. In this, many fail spectacularly because they don't even try. The Bible says that "you will know them by their fruits", meaning that you can determine what's going on in someone's heart and mind by what they do and what comes of their life. And the aforementioned people have no fruit...or sometimes, bad fruit. 
Place me like a seal over your heart, like a seal on your arm; for love is as strong as death, its jealousy unyielding as the grave. It burns like blazing fire, like a mighty flame. -- Song 8:6 |