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Who wrote the New Testament? When was it written? Under what circumstances was it written? Ehrman tries to answer these questions, as well as breaking down the discrepancies, contradictions and agreements among the Gospels.
From there, he drills down to what we actually know about the historical Jesus and what he taught.
The tone is largely conversational, rather than confrontational. At no point does he suggest that science and historical fact (to our ability to know historical fact) preclude faith.
Ehrman uses, "there's enough research out there that I don't have to repeat it here" a bit too often, but by and large his research seems solid.
It shouldn't test your faith, but it could give you a much stronger understanding of what the Bible teaches, what Jesus taught, and how the messages changed over the centuries of Christianity.