This book asserts that until the 18th century and the vagaries of Court de Gebelin the tarot had no 'occult' associations. Actually if we trace the tarot back through its Mamluk incarnation in medieval Egypt and even further back via its diffusion by the Mongols and spread along the Silk Road as the art of paper-making was transmitted into the Muslim world, back to China of the 7th century where woodblock printed cards generically term P'ai were used, we witness their origin during the 6th century BC in methods of shamanistic arrow-divination in Korea, where strips of silk inscribed with symbols and images were attached to arrows and used by shamans in prognostication. Eventually the arrows were no longer used but only the narrow oiled silk 'cards' which were in 9 card suits of various beasts, birds, stars etc each with a singler court card of a 'general'. These passing northward into China became the printed money-suited cards which spread estward into Persia and Egypt and eventually into Europe, the ancestor of tarot and playing-cards as Dr Stewart Culin demonstrated. Not to mention the use of tarot in divination and magical practises in Europe pre-dating Decker and Dummett's construct such as among 16th century Venetian sorceresses as recorded by the Inquisition and noted by the historian Ruth Martin. Paul Huson's 'Mystical Origins of the Tarot' also provides a much more rounded picture of tarot and cartomancy from a historical perspective.
It's more instructive I think to see how the tarot was derived, via a long and fascinating process from shamanistic divination practises in eastern Asia and that divination was, in fact, an integral aspect of the cards right from their beginning. But we should recall in any case that in the ancient world divination and gaming were closely related activities and borne from a common root. I think we have to remind ourselves of this with the 'sceptic' or 'debunking' school who claim that tarot had no 'occult' or 'divinatory' attributes until the fanciful superimpositions of the 18th century - it's not hard to see how this tendency represents little more than a new modernist 'pseudo-mythos' which is intended to deny and negate the tarots inherent metaphysical and spiritual content and context. Better by far to heed the words of the traditionalist metaphysician Rene Guenon who whilst dismissing (quite rightly) the modern occultist and pseudo-Kabbalistic accretions nonetheless recognized in the tarot 'vestiges of an indubitably traditional science.'
If the 18th and 19th century occultists constructed a faux-historical fantasy about the 'Book of Thoth' and 'kabbalistic' patterns and superimposed these upon tarot, the 'sceptical' post-modern school is just as involved in superimposing a similarly specious hypothesis in which tarot as a 'simple game' never had any inherent spiritual symbolism or esoteric dimension until invested with such in modern times. Both these tendencies are to be viewed as questionable, both are typical products of the modern mentality, its flawed perspectives, literalistic misperception and inability to understand traditional symbology.