Well, if you have to ask...
I'm an atheist, and am actually a big fan of word of Jesus. The ideas were revolutionary for morality and ethics in the ancient world. Whether or not Jesus was diving, or even really existed, is unimportant in this respect.
But, having said that, I'm afraid you can find all sorts of examples in the Bible that contradict each other, especially between the Old and New Testaments (e.g. stoning gays vs. loving one another). Not to mention the conflicting geneologies of Jesus in the gospels. (And I'm sure other posters will chime in soon with more examples.) Furthermore, biblical scholars worth their salt do not believe in the literal truth of the text, since it has been translated, edited, and redacted many times over. Much has been lost, forgotten, rejected (Gnostic gospels anyone?), or just plain ignored.
Finally, my biggest complaint with Christians in general is that more often than not they themselves pick and choose which portions of the Bible are true. Just look at the anti-abortion types in the States who also want to cut back on Social Security or Medicare -- a position that is clearly not "pro-life", nor follows through with Jesus' adminitions to take care of the least fortunate. If you wish to use Jesus' teachings as the basis of your ethics, fine -- but either be consistent, or be prepared to be exposed as a hypocrite.