Oh, he doesn't deny it. That is, he doesn't deny that the Bible asserts Jesus' divinity. For example, in this blog entry (https://ehrmanblog.org/jesus-as-divine-in-the-synoptics-for-members/), he says, "in the Gospel of John there is little doubt about the divinity of Jesus." However, as he explained to me, theology is not what he does. He does history. Jesus was fully God and fully man, right? Ehrman is interested in the man part.