Religion's regressive hold on animal rights issues
Although he acknowledges that some religious beliefs are progressive he is generally dismissive. He writes for instance that "some Christian theologians offer a kinder, more compassionate interpretation of the idea of our God-given dominion over the animals. They regard the grant of dominion as a kind of stewardship, with God wanting us to take care of his creatures and treat them well."
But he believes that religion has a generally regressive influence on ethical issues "whether they are concerned with the status of women, with sexuality, with end-of-life decisions in medicine, with the environment, or with animals. Although religions do change, they change slowly, and tend to preserve attitudes that have become obsolete and often are positively harmful."
Singer is really a product of the Enlightenment, where religion must be viewed through a negative tinted lens, and progress must be seen in purely secular humanistic terms. Singer's ethics though are subjective to human sentiment where a cute furry animal is to have more rights than an unborn child that is out of sight. The list he gives is the usual shallow liberal issues where there is a lack of depth of thought regarding who has rights and values. There is a lack of concern for responsibility towards others; except for animals. However, one wonders why Singer thinks he has the right to have a greater voice than others given a common rationality amongst human beings. Clearly for ethics to have real objective substance beyond human sentiment there is a need for a higher authority who seeks to bring equality.
I would also point out that there are many Christians who are concerned about environmental issues and animal suffering as well. Experimentation on animals is something that is great concern to many Christians who do see that they have value and should be protected from unnecessary harm.