Are humans born with a sinful nature?

This is my first blog on many biblical theology questions that I am starting to explore. I think that churches today have somewhat skewed what the Bible really says. After listening to a sermon found on www.nogreaterjoy.org by Michael Pearl I have come to question doctrine that I have been taught and realized that faith in God should be my own. Therefore I have begun studying it deeply. I will be the first to say that I don't have all the answers, but, I think it will be fun to spur people on to get into God's word themselves to figure it out. I invite you to come with me on a quest to find what God really wants for us. I encourage you to ask questions and let people know what you find. The first question at hand is, are humans born with a sinful nature? Most christians would say yes. I on the other hand do not. I believe that if every human was born with a sinful nature then sin wouldn't be bad. It would be natural. Would God put a natural desire to sin in us from birth? Then judge us for it? What do you think...