Convinced of his own status, he was intolerant of those who rejected him, assassinated those who criticized him, raided and looted those who did not believe in him, and massacred entire populations.
He reduced thousands into slavery, raped and allowed his men to rape female captives.
He was generous to those who accepted him, but vengeful towards those who didn?t.
Punishments for taking a stand against Muhammad included torture and death.
Both men and women were brutally killed for criticizing Muhammad.
Hundreds of Jewish men were beheaded for standing against him, while their wives and children were sold into slavery.
Some early Muslims who apostatized were killed after Muhammad gave the command to kill all who turn away from Islam.
He murdered numerous people whose only crime was writing poems against him.

628 AD  The conquest of Khaybar  Muhammad and the Muslims besiege the Khaybar oasis. The combatants killed, and the women and children allotted as booty. The Jewish leader, Kinana, is tortured and beheaded, and his young widow, Safiyah, is taken by Muhammad for himself. (read more) 
628 AD  Poisoned at Khaybar  Immediately following the conquest of Khaybar, Muhammad and his men are served a meal of poisoned lamb by a Jewish women named Zaynab bint al-Harith, causing him to fall ill. Muhammad questions her,[17] and then has her executed.[18] 
630 AD  The conquest of Mecca  The Muslims conquer Mecca. Muhammad rides on camel-back to the Ka'aba, then starts reciting verses from the Qur'an, while his men remove and destroy everything they consider idolatrous from the Ka'aba. This is the first of many non-Muslim worship places to be forcibly converted into a mosque. (read more) 
630 AD  Muhammad rules Arabia  The Muslims prevail in the Battle of Hunayn against the Bedouin tribe of Hawazin and conquer Ta'if. In doing so, they capture huge spoils, consisting of 6,000 women and children and 24,000 camels. Muhammad is now the ruler of Arabia. 
631 AD  All Arabians submit to Islam  Muhammad sends (the now converted) Khalid ibin al-Walid and other warriors to the remaining non-Muslim Arabian tribes, forcing them to accept Islam.[19] 
631 AD  The Tabuk raid  The expedition to Tabuk marked the first real act of aggression by the Muslims against Christians. Two/thirds of the Christian world would be conquered before the much belated and weak response of the crusades. By the time Muhammad arrives at Tabuk, the Byzantine troops have already withdrawn. However, the local Christian leaders are forced to pay Jizyah and submit to Islamic rule. 
632 AD  The Farewell pilgrimage  After completion of the pilgrimage, Muhammad delivers his famous sermon which leads to the commencement of the conquests against the Christians and Zoroastrians. (read more) 
632 AD  Death of Muhammad  Muhammad's last days are spent with Aisha in her house, where he continues to issue orders and curse the Christians and Jews.[20][21] Slumped against her bosom,[22] he finally dies on the 8th of July. Ali (Muhammad's son-in-law and cousin) reports that Muhammad's penis was erect after his death.[23] (read more)