W riting about Muhammad, the prophet of Islam, the Orientalist scholar W Montgomery Watt wrote: "Of all the world's great men, none has been so much maligned as Muhammad. This claim is a recurring one among critics of Islam , so its foundation deserves close scrutiny. Critics allege that Aisha was just six years old when she was betrothed to Muhammad, himself in his 50s, and only nine when the marriage was consummated. They base this on a saying attributed to Aisha herself Sahih Bukhari volume 5, book 58, number , and the debate on this issue is further complicated by the fact that some Muslims believe this to be a historically accurate account. Although most Muslims would not consider marrying off their nine-year-old daughters, those who accept this saying argue that since the Qur'an states that marriage is void unless entered into by consenting adults, Aisha must have entered puberty early.
Islamic sexual jurisprudence - Wikipedia
Criticism of Muhammad has existed since the 7th century, when Muhammad was decried by his non-Muslim Arab contemporaries for preaching monotheism , and by the Jewish tribes of Arabia for what they claimed were unwarranted appropriation of Biblical narratives and figures ,  vituperation of the Jewish faith ,  and proclaiming himself as " the last prophet " without performing any miracle or showing any personal requirement demanded in the Hebrew Bible to distinguish a true prophet chosen by the God of Israel from a false claimant. Modern religious    and secular     criticism of Islam       has concerned Muhammad's sincerity in claiming to be a prophet, his morality, his ownership of slaves ,   his treatment of enemies, his marriages ,  his treatment of doctrinal matters, and his alleged psychological condition. Muhammad has been accused of sadism and mercilessness —including the invasion of the Banu Qurayza tribe in Medina       —sexual relationships with slaves, and his marriage to Aisha when she was six years old,    which according to most estimates was consummated when she was nine. Many early former Muslims such as Ibn al-Rawandi , Al-Ma'arri , and Abu Isa al-Warraq were famous religious skeptics , polymaths , and philosophers that criticized Islam,  the alleged authority and reliability of the Qu'ran ,  Muhammad's morality,  and his claims to be a prophet. The Quran also mentions critics of Muhammad ; for example Quran says the critics complained that Mohammad was passing off what others were telling him as revelations:. Those who disbelieve say, "This is nothing but a lie that he made up, and others have helped him at it
Criticism of Muhammad
And rightly so, for he is the hub of cartoons, riots, and beheadings. His many pronouncements form the foundation and structure of Islam and range from war to sex, medicine to assassinations, snakes to angels, eating to excrement. Writers, both pro and con, have described Muhammad from whoremonger to Puritan. Some critics claim Muhammad was a pedophile while supporters say that his marriages were only for platonic or political reasons. Wherein lies the truth?
Muhammad and his followers fought many battles. Some were offensive some were defensive. Following a victory the Muslims would take captives, or prisoners of war. Muhammad would usually distribute the captives, both male and female, as slaves to his soldiers. Islam provides some basic rights to its slaves but these rights are limited.