How can we know what we believe? When you ask someone the question "What do you believe?", you can get all kinds of answers. But they may not be telling the truth. Furthermore, they may not even realize they are lying. I believe that the way a person acts is far more telling about what they believe than what they say. You can claim to believe certain things all day long, but without actions to back it up, all the words you say are meaningless.
So what should be done about this? My short answer is live in a way that the beliefs that you speak match the beliefs that you live. Getting to this point is not easy, but then you won't be a hypocrite, or a liar.
In summary, saying that you believe one thing and living inconsistantly with that is pointless, and helps no one.