No, not at all.  We are simply using the writings of the early Christians to help us better understand what was actually meant by the people who wrote the Bible, since it seems likely that they knew more about what was meant by their writings than any 19th or 20th century theologian could possibly know.  Because of the benefit of oral tradition, knowledge was passed from Jesus to the Apostles to their disciples, and ultimately became the basis for the writings of the early Christians.