Taslima shares a long string of excerpts from the Koran and the Hadith that mandate the kind of thing the murderers did to Avijit Roy.
The Islamic killers used big sharp knives to kill Dr. Avijit Roy, the well known progressive blogger. ISIS terrorists use sharp knives to behead people. They like knives because Muhammad liked knives to kill nonbelievers. Islamist leaders convince fellow Islamists to kill nonbelievers for the sake of Islam. Allah Himself advise people to kill. There are many Islamic organizations in Bangladesh working to indoctrinate young people with Islam. The leaders of those organizations insist people to believe in the Quran, the words of Allah and the Hadith, the words of Muhammad. Governments and almost all established organizations encourage people to believe in Allah the God and Muhammad the messenger.
If you are a Muslim, you have to believe in the Quran and Hadith. And if you believe in the Quran and Hadith, you have to agree with Allah that atheists should be brutally killed. These are the texts that inspire Islamists to kill Avijit Roy, the freethinker. These are the texts that inspire ISIS, Boko Haram, Al Shabaab etc. to kill nonbelievers and non-Muslims.