Why do animals suffer?? How will they be rewarded after death?? Why do god show no mercy towards animals if he is so merciful??
Suffering of any kind can arise for a multitude of reasons, all of which require no invoked God concept in their explanation. This however isnt really the interesting question here.
Im much more drawn to the fact that the Abrahamic religions dont seem to value or acknowledge animal welfare to anywhere near the degree they should to count as a legitimate modern day worldview. In my opinion, this among many other failures is something that these religions need to be called up on, and made to answer for. To be put under the spot light of modern day rationality and made to honestly confront these issues and the consequences fostering, defending and maintaining them has caused.
Contrary to what this family of religions might claim, they are far from humble philosophies, and are very human-centric; placing us at the centre of everything, disregarding other creatures in the process, reducing them to mere property and objects to be used at mans discretion.
(Ironically even though they are quite self centered with regards to humankind they are paralyzing disempowering at the same time, and I think its a dangerous formula that creates a servile, constrained people.)
The lack of express mention of animal rights and welfare causes it to be overlooked and sidelined, thus enables the substandard and downright criminal treatment of animals that has dominated the culture throughout history.
The truth is some worldviews are better than others, especially when we consider the well being of conscious creatures. Jainism for example has non-violence as a core principle, and through it all forms of life are awarded the same respect and consideration that human life has.
The lack of animal rights in the philosophies of these religions really demonstrates the broken nature of their ethical framework. The arbitrary word of God(as claimed) is believed to the source of what good is. He is what defines good, but the problem is if youre made to believe this, (which is what the very business of these religions is) you become ethically servile to an arbitrary authority. Coupled with the lack of content regarding animal rights and welfare in the holy books, you are forced to a conclusion that its not important, causing people to overlook it resulting in a religiously influenced culture that has contributed greatly to the mistreatment of animals over the ages. Shameful.