Why do you see the truth as one truth?

Let me answer this at two levels.
At a purely rationale and logical level, if there is a truth, there cannot be multiple truths that contradict one another. Different world views may share a belief in particular truth principles but there cannot be contradictory ones. If there were we would have no certainty, the world would not be rationale and science, for example, would not be possible. But it is, scientists can cure illnesses and put men in outer space. The same applies to truths or principles in the human world. As I mentioned in the first talk, if radical forgiveness as it is understood in Christianity is a law, a true principle on which human beings flourish, then not doing this will result in less life and conforming to it will result in more life.
Second, I have found over the last 17 years that the principles I see written in the Bible when I explore them in application to my life and my observation of the world are more true than any other framework of which I am aware and have tried (which have been many). Therefore, I no longer have trouble believing the truth claims of Christ and the Bible.