Numerous tracts were published criticising his work. In response, Gibbon defended his work with the 1779 publication of
A Vindication of Some Passages in the Fifteenth and Sixteenth Chapters of the History of the Decline and Fall of the Roman Empire. Historian
Hugh Trevor-Roper wrote: "The success of Gibbon's
Vindication was immediate and complete. ... It had been one of the decisive battles of literary history." Gibbon's central thesis in his explanation of how the Roman Empire fell, that it was due to
embracing Christianity, is not widely accepted by scholars today. Gibbon argued that with the empire's new Christian character, large sums of wealth that would have otherwise been used in secular affairs in promoting the state were transferred to promoting the activities of the Church. However, the pre-Christian empire also spent large financial sums on
religion and it is unclear whether or not the change of religion increased the amount of resources the empire spent on it. Gibbon further argued that new attitudes in Christianity caused many Christians of wealth to renounce their lifestyles and enter a
monastic lifestyle, and so stop participating in the support of the empire. However, while many Christians of wealth did become monastics, this paled in comparison to the participants in the imperial bureaucracy. Although Gibbon further pointed out that the importance Christianity placed on peace caused a decline in the number of people serving the military, the decline was so small as to be negligible for the army's overall effectiveness.
John Julius Norwich, despite his admiration for Gibbon's furthering of historical methodology, considered his
hostile views on the
Byzantine Empire flawed, and blamed him somewhat for the lack of interest shown in the subject throughout the 19th and early 20th centuries. Gibbon prefaced subsequent editions to note that discussion of Byzantium was not his interest in writing the book. However, the
Yugoslavian historian
George Ostrogorsky wrote, "Gibbon and
Lebeau were genuine historians – and Gibbon a very great one – and their works, in spite of factual inadequacy, rank high for their presentation of their material." Gibbon challenged Church history by estimating far smaller numbers of
Christian martyrs than had been traditionally accepted. The Church's version of its early history had rarely been questioned before. Gibbon, however, said that modern Church writings were
secondary sources, and he shunned them in favour of
primary sources. Historian S. P. Foster says that Gibbon "blamed the otherworldly preoccupations of Christianity for the decline of the Roman empire, heaped scorn and abuse on the church, and sneered at the entirety of monasticism as a dreary, superstition-ridden enterprise". Gibbon's work was originally published in sections, as was common for large works at the time. The first two volumes were well-received and widely praised, but with the publication of volume 3, Gibbon was attacked by some as a "
paganist" because he argued that Christianity (or at least the abuse of it by some of the clergy and its followers) had hastened the fall of the Roman Empire. In this regard, Gibbon's attitudes were shaped by the contemporary
anti-clericalism &
secularisation of the
Enlightenment-era.
Voltaire was deemed to have influenced Gibbon's claim that Christianity was a contributor to the fall of the Roman Empire. Gibbon has been criticized for his portrayal of Paganism as tolerant and Christianity as intolerant. In the beginning of 1800s, the book was a matter of controversy in the
Kingdom of Brazil. The royal censor
José da Silva Lisboa had it forbidden on the grounds of having dangerous ideas for the
United Kingdom of Portugal, Brazil and the Algarves, but it was later permitted by the censor
Francisco de Borja Garção Stockler on the grounds of being "one of the few products that are most admirable for the human spirit". == Legacy ==