Professor Ehrman is, above all else, a fair scholar. Yes, evidence requires some amount of interpretation. There are competing theories and sometimes one theory does a better job in accounting for the available facts than others. There are conclusions drawn from evidence over which reasonable people can disagree. The vital contribution Ehrman makes in this book, written for a popular audience, is to demonstrate that there is a complete lack of evidence to support the speculation there was never an historical Jesus.
By first reviewing the mythicist literature and noting the tendencies of some authors to make completely unsupported assertions, to a serious critique of writers such as Robert Price, Ehrman demonstrates mythicists lack of evidence to conclude that Jesus was never an historical person and was, instead, a complete myth. He then uses patient precision to review the extensive evidence for an historical person named Jesus, what the evidence states and what we can know about him.
For anyone who has wondered if there is any substance behind a purely mythical Jesus, I recommend this book. Special attention should be paid to how we come to know something about a person in history. After completing it readers should feel better prepared to ask mythicist proponents for their evidence. Not merely to point to the lack of evidence for the details of the life of Jesus, but rather evidence that supports he was purely constructed. They should also feel more confident citing the evidence in favor of an historical Jesus and why that evidence can considered a valid basis for drawing conclusion.
What must first lead our theories is the evidence. Once we have gathered evidence we can attempt to interpret it. Ehrman does this in his usual deliberate and yet engaging writing manner in defense of an historical Jesus.