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If you don't have faith in the Bible, then you have no business preaching, period. If you think it's been misinterpreted, then that is fine–there are plenty of different sects of Christianity that have branched off for exactly that reason. But to say "I don't believe the bible is accurate" marks you as a potential false prophet. Just where exactly would you make your changes–and where would they come from? Your feelings?
History is littered with thousands of those who would twist and/or add to the Bible to fit their agenda. Look up the Family, David Koresh, and Jonestown Massacre for just a few examples–you can find more of them preaching on the streets. These people decided that they would teach others the true meaning of the Bible, and a scant few of them are undoubtedly inspired. But for most, it didn't end well.
It would be best to start with humility. You need to put your "I believe" aside and weigh it against what was said by Jesus, because the temptation to reinterpret the Bible for one's own gain is a temptation not strictly limited to "other" people. We are all tempted by sin–when I was younger I had the same feelings you do now, and was even given a clear, inspired message that changed the course of my life–often for the worse. I did not associate it with Christianity at the time, having been raised with the freedom to choose my own faith. But as I grew older, I started to make the connections and chose Christianity, based off of what I knew to be true regarding human nature and reality. It is simply the only doctrine that could produce the prosperity we take for granted–it is the reason why the United States was referred to by President Reagan as the "shining city upon a hill."
America is exceptional because the founders rejected the rule of men in favor of God. You can see evidence of such faith throughout our laws–Christianity, when interpreted strictly through the Bible, is what gave our forefathers the humility to allow that others might be "more right" than themselves, and therefore could practice Christianity (and indeed, all religions) as they wish. But step outside the details, and you see that there is a divinely-inspired philosophy behind, for instance, the authors of the Bill of Rights: "do unto others as you would have them do unto yourself." Surely, they did not want to have their guns or free speech taken away–so they granted those rights to others, as instructed (in the form of the Golden Rule) by Jesus.