“When one thinks of mass murder, Hitler comes to mind. If not Hitler, then Tojo, Stalin, or Mao. Credit is given to the 20th-century totalitarians as the worst species of tyranny to have ever arisen. However, the alarming truth is that Islam has killed more than any of these, and may surpass all of them combined in numbers and cruelty. The enormity of the slaughters of the ‘religion of peace’ are so far beyond comprehension that even honest historians overlook the scale.” – Mike Conrad, The Greatest Murder Machine in History 
“The Mohammedan conquest of India was probably the bloodiest story in history.” – Will Durant, American historian 
“…The Indian (subcontinent) population decreased by 80 million between 1000 (conquest of Afghanistan) and 1525 (end of Delhi Sultanate)” – Koenraad Elst, Negationism in India 
Muhammad Ghori and Qutab Aibak – Late 12th Century Onwards
Excerpts from “The Magnitude of Muslim Atrocities” 
The invasion of India by Islamic imperialism was renewed by Muhmmad Ghori in the last quarter of the 12th century. After Prithiviraj Chauhan had been defeated in 1192 CE, Ghori took Ajmer by assault.
According to the Taj-ul-Ma’sir of Hasan Nizami, “While the Sultan remained at Ajmer, he destroyed the pillars and foundations of the idol temples and built in their stead mosques and colleges and precepts of Islam, and the customs of the law were divulged and established.”
Next year he defeated Jayachandra of Kanauj. A general massacre, rapine, and pillage followed. The Gahadvad treasuries at Asni and Varanasi were plundered. Hasan Nizami rejoices that “in Benares which is the center of the country of Hind, they destroyed one thousand temples and raised mosques on their foundations”.
According to Kamil-ut-Tawarikh of Ibn Asir, “The slaughter of Hindus (at Varanasi) was immense; none were spared except women and children, and the carnage of men went on until the earth was weary.”
The women and children were spared so that they could be enslaved and sold all over the Islamic world. It may be added that the Buddhist complex at Sarnath was sacked at this time, and the Bhikshus were slaughtered.
Ghori’s lieutenant Qutbuddin Aibak was also busy meanwhile. Hasan Nizami writes that after the suppression of a Hindu revolt at Kol (modern-day Aligarh) in 1193 CE, Aibak raised “three bastions as high as heaven with their heads, and their carcasses became food for beasts of prey. The tract was freed from idols and idol worship and the foundations of infidelism were destroyed.”
In 1194 CE Aibak destroyed 27 Hindu temples at Delhi and built the Quwwat-ul-Islam mosque with their debris. According to Nizami, Aibak “adorned it with the stones and gold obtained from the temples which had been demolished by elephants”.
In 1196 CE he advanced against Anahilwar Patan, the capital of Gujarat. Nizami writes that after Raja Karan was defeated and forced to flee, “fifty thousand infidels were dispatched to hell by the sword” and “more than twenty thousand slaves, and cattle beyond all calculation fell into the hands of the victors”.
The city was sacked, its temples demolished, and its palaces plundered. On his return to Ajmer, Aibak destroyed the Sanskrit College of Visaladeva, and laid the foundations of a mosque that came to be known as ‘Adhai Din ka Jhompada’.
The conquest of Kalinjar in 1202 CE was Aibak’s crowning achievement. Nizami concludes: “The temples were converted into mosques… Fifty thousand men came under the collar of slavery and the plain became black as pitch with Hindus.”
A free-lance adventurer, Muhammad Bakhtyar Khalji, was moving further east. In 1200 CE he sacked the undefended university town of Odantpuri in Bihar and massacred the Buddhist monks in the monasteries. In 1202 CE he took Nadiya by surprise. Badauni records in his Muntakhab-ut-Tawarikh that “property and booty beyond computation fell into the hands of the Muslims and Muhammad Bakhtyar having destroyed the places of worship and idol temples of the infidels founded mosques and Khanqahs”.
- Mike Conrad, The Greatest Murder Machine in History, available online at https://www.americanthinker.com/articles/2014/05/the_greatest_murder_machine_in_history.html#ixzz5MlGTaPYS
- Will Durant, The Story of Civilization, Ch. XVI
- Koenraad Elst, Negationism in India, Voice of India, New Delhi, 2002, p.34
- The Magnitude of Muslim Atrocities: https://jesusallah.wordpress.com/2008/07/11/the-magnitude-of-muslim-atrocities-ghazanavi-to-amir-timur/