"How does a denial, a doubt, of their historicity lead logically to a similar denial of New Testament..."

How does a denial, a doubt, of their historicity lead logically to a similar denial of New Testament miracles? Supposing that sound critical reading revealed different kinds of narrative in the Bible, surely it would be illogical to suppose that these different kinds should all be read the same way?

Where I doubt the historicity of an Old Testament narrative, I never do so on the ground that the miraculous as such is incredible. Nor does it deny a unique sort of inspiration: allegory, parable, romance, and lyric might be as inspired as well as chronicle.