Why are Christians such hypocrites?

Christianity is a beautiful and flawless piece of music composed by God. Sometimes, the musicians attempting to play it hit a few wrong notes or play it off key. Some make such an awful noise that they cause their audience to run away from them, holding their ears. But every now and then, a musician who is practiced in their Christianity plays the music and it is glorious and wonderful and sweet. We shouldn't fault the composer (Jesus) when unpracticed musicians play His composition; a composition should be judged when it is played by the best, not the worst.