First of all, the bible, in its whole form (old and new testament) is completely contradictory. One has to remember that with the coming of jesus christ, all of the 'old laws' (old testament) were re-interpreted by jesus. From what I have read, the overall theme of the new testament is completely different from that of the old testament. Probably none of the stories that are told in the old testament could be written in the new testament. Although there is no passage to directly quote from concerning this (besides jesus rattling off the sermon on the mount), I think the whole idea of 're-interpretation' of God's Law is one of the most damning contradictions of the christian bible.
While not contradictions contained in the bible, contradictory beliefs that contemporary christians hold run rampant. I've discussed the use of force many times with christians and asked them to try and resolve the problem of pacifism contained throughout the bible. Since many of these people are patriotic (emotionally based), the idea that going to war as being evil, really rubs them wrong; therefore, I get mountains of justifications for the use of force based upon old testament writings. I don't know if these christians know that the christian bible has a totally changed set of 'law' or not, but personally I think the contemporary American christian uses the old and new testaments interchangeably because they don't know any better.
Here are some striking passages that I've collected throughout my reading of the bible. I think all of them would be totally contradictory to the thoughts and principles of most contemporary christians--at least I hope so.
Romans 13:1-7, Submission to Authorities: http://www.biblegateway.com/passage/?book_...r=13&version=31 --The Taliban was sanctioned by god.
1 Peter 2:13-15 Submission to Rulers and Masters: http://www.biblegateway.com/passage/?book_...er=2&version=31 --13-17 Submit to your dictator; 18-21 Slaves, submit and respect your owners, most of all if he is harsh.
Titus 2:9-10 http://www.biblegateway.com/passage/?book_...er=2&version=31 --Slaves, obey your masters so the word of "God Our Savior" looks "attractive"
1 Timothy 6:1-2 http://www.biblegateway.com/passage/?book_...er=6&version=31 --Obey your masters, especially if they are a believer, your just helping the cause.
Matthew 5:38-42 http://www.biblegateway.com/passage/?book_...er=5&version=31 --"You have heard that it was said, 'Eye for eye, and tooth for tooth. But I tell you, Do not resist an evil person. If someone strikes you on the right cheek, turn to him the other also."
Matthew 5:42-48 http://www.biblegateway.com/passage/?book_...er=5&version=31 "You have heard that it was said, 'Love your neighbor and hate your enemy.' But I tell you: Love your enemies and pray for those who persecute you, that you may be sons of your Father in heaven. He causes his sun to rise on the evil and the good, and sends rain on the righteous and the unrighteous. If you love those who love you, what reward will you get? Are not even the tax collectors doing that? And if you greet only your brothers, what are you doing more than others? Do not even pagans do that? Be perfect, therefore, as your heavenly Father is perfect."