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Roger's Version 
John Updike, 1986
Knopf Doubleday
480 pp.
ISBN-13: 9780449912188

Summary
A born-again computer whiz kid bent on proving the existence of God on his computer meets a middle-aged divinity professor, Roger Lambert, who'd just as soon leave faith a mystery.

Soon the computer hacker begins an affair with professor Lambert's wife — and Roger finds himself experiencing deep longings for a trashy teenage girl. (From the publisher.)