Second, calling yourself a Christian is the only way for others to determine if you are Christian or not. Otherwise, there would be no true Christians, since everyone falls short. We don't know what's in a person's heart. But the only thing that really says whether a person is a Christian or not is that they believe that Jesus is the way to reach Heaven or know God. That is it. Bad Christians are still Christians. You don't get to discount them just because you don't want to be associated with them.