Well it is true that most "Christians" aren't even christians. Acts 11:25-26,"the first disciples were called christians" So in order to be a christian, you must be able to call yourself a disciple. and to be a disciple, you must follow Christ, and to follow Christ you must know Christ and know what He did for us. the sad part is, most people think that all they have to do is believe in God to be a christian, so those "christians" don't know who they are in Christ, but as for true christians that take up their cross daily, and live like Christ does, yes we know who we are in Christ