Labour MPs are questioning the existence of God - but the Tories are more worried about the existence of Gord, a survey suggests.
The God Delusion, by atheist Richard Dawkins, has been named by Labour MPs as their favourite holiday read.
Tory MPs are more likely to have their noses buried in Tom Bower's biography of Prime Minister Gordon Brown.
But William Hague's biography of anti-slavery campaigner William Wilberforce was their top choice.
Liberal Democrat MPs also plan to plough through The God Delusion and Mr Hague's Wilberforce biography - but will also be picking up Harry Potter and the Deathly Hallows, according to the survey of 180 MPs by bookseller Waterstones.
And Conservative MPs will be dipping into a biography of Sir Robert Peel by former Foreign Secretary Douglas Hurd, according to the survey.
SUMMER READS
The most popular author was former Liberal Democrat leader Paddy Ashdown, with three titles selected (The Ashdown Diaries, Contemporary Conflict Resolution and Swords and Ploughshares: Building Peace in the 21st Century).
Other choices included classics such as Don Quixote, Pride and Prejudice, and Vanity Fair, as well as the recent book by former US vice president Al Gore on global warming, An Inconvenient Truth.
Among politicians from the three main parties, books by Mr Hague, Mr Dawkins and Ms Rowling were the most popular.
Also in the top 10 were Mr Bower's biography of the prime minister and The Blair Years, Alastair Campbell's account of his time as Downing Street's spin doctor.
Michael Foot: A Life by Kenneth O Morgan, Lord Hurd's biography and The War of Ideas: Jihadism Against Democracy by Walid Phares were also going to be read by MPs on holiday.
Salmon Fishing in the Yemen by Paul Torday and Restless by William Boyd also made the top 10.
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