We rightly criticise Islam, but in doing so we must not forget the barbarism of some other non-Christian religions.
While, after the coming of Jesus, in the parts of the world that adopted Christianity animal sacrifices have disappeared, they are still practised elsewhere to this day.
The largest-scale massacre of animals is not to be found in the Islamic world but - this may be a surprise for some - in Hiduism.
Perhaps we should think of this next time we hear that Eastern religions are good for animals.
What animal equality campaigners have called a "slaughterhouse under the open sky" and "the world's largest mass animal sacrifice" is a religious festival to honour the Hindu goddess of power Gandhimai, that was held over the weekend at her temple in the remote village of Bariyapur in Nepal, near the Indian border.
Sword-wielding Hindus poured into Bariyapur, where the Gadhimai killing started on Friday at midnight and lasted two days, Friday and Saturday.
On the previous occasion in 2009, the "festival" of blood attracted a million Hindu worshippers from India and Nepal and an estimated 300,000 animals were killed, either by having their heads chopped off or by having their throats slit. This year the number of animals massacred was expected to be over half a million.
It always begins with the ritual killing of five animals: a goat, rat, chicken, pig, and pigeon. Buffaloes are then slaughtered throughout the first day.
As animal campaigners say and common sense tells, the untrained butchers cause a great deal of suffering to animals.
On Friday, thousands of animals' dead bodies and severed heads started piling up in a large field near the village where devotees were carrying out the sacrifices. The reason for the bloodbath lies in the Hindu belief that the goddess Gadhimai, pleased through the suffering and death of these animals, will give their killers health and prosperity.
"It is very festive here, everyone is excited," maintained Mangal Chaudhary, the head priest at the slaughter site.
"It is very bloody... you can hear the animals moaning," Rameshwor Mehta, 50, who was waiting to offer his prayers, told the media.
Sita Ram Yadav, a 55-year-old farmer, said the atmosphere was "like a carnival". He added: "I am offering a goat to Gadhimai to keep my family safe. If you believe in her, she grants your wishes."
Manoj Shah, a 45-year-old Nepali driver who has been attending the event since he was 6, explained: "It is the traditional way. If we want anything, and we come here with an offering to the goddess, within 5 years all our dreams will be fulfilled."
Animal campaigners and human beings with a minimum of compassion have denounced the brutality with which thousands and thousands of animals find death in the Gadhimai festival.
The director of the Indian branch of the Humane Society International describes the scene thus: "Pools of blood, animals bellowing in pain and panic, wide-eyed children looking on, devotees covered in animal blood, and some people even drinking blood from the headless but still warm carcasses."
Animal Welfare Network Nepal was is in Bariyapur to protest against the barbaric ritual, while a campaign to ban the massacre has attracted support from British actress Joanna Lumley and French cinema legend Brigitte Bardot, who has petitioned Nepal's president to end the "cruel tradition" .