For most of American history, of course, the important religious divides were between denominations - not just between Protestants and Catholics and Jews but between Lutherans and Episcopalians and Southern Baptists and the other endlessly fine-tuned sects.

Previously, young children had to be shown by their parents how to use a mouse or a remote, and the connection between what they were doing with their hand and what was happening on the screen took some time to grasp. But with the iPad, the connection is obvious, even to toddlers.

On the one hand, parents want their children to swim expertly in the digital stream that they will have to navigate all their lives; on the other hand, they fear that too much digital media, too early, will sink them.

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