"The congregation assumes that we mean what we say and seldom asks us, 'do you actually believe that stuff or are you just paid to say it?' ...what we are ought to match what we proclaim and we are uneasy when it doesn't.. Standing in the pulpit takes us directly into questions of personal integrity, authenticity, holiness and transparency. We want to be WYSIWYG preachers where what the congregation sees is what it gets. It was said of John Chrysostom that he 'gesticulated with his whole existence.' "
If you're delivering a message that you're not personally committed to, that makes you a postman, not a preacher.
(David Day, Embodying the Word)
Same goes if you're 'just' a plain old follower of Jesus.