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Islam is not only a religion but also a Deen, which means a complete code of life. Religion deals man's relation with God whereas Deen deals with both with man's relation with God and his fellow beings. Religion deals with private affairs of life whereas Deen covers all aspect of life, individual as well as collective....."
Deen vs Religion | Islamic Studies, CSS Notes, Topic-3
In my experience, humans have natural human instincts, as well as personality/behavioral firmware, which defines us as a species; human nature. These are common to all humans; collective human propensities. We all can fall in love no matter your culture or beliefs. This is part of our common human nature.
Humans are also free moral agents who have will power and can make choices. All major religions are designed to help humans maintain contact with our natural human instincts and propensities, common to all. They differ, by the wild card, which is how to use will power and choice.
The paradox of willower and choice, is it can be used to engage in natural as well as unnatural human behavior. In terms of natural behavior, it can be used to laterally diversify natural instinct and behavior. As an example of this is eating. We have a natural instinct to eat. Humans are omnivores, which means we can eat endless varieties of food, that are all good for the body without harming this instinct.
However, since this lateral change for new foods is connected to choice, some foods, in some religions, may be taboo. This is to place limits on choice, so changing natural instinct does deviate too far. The Koala Bear eats Eucalyptus leaves. He can be made to eat, based on a science diet, without harming his body or instinct to eat. However, this could conflict and change other behavior such as tree climbing. There is caution in some religions to various willpower and choices, but the same precautions are not common in all religions.
If you look at abortion, this is not part of natural human instinct. It is called a women's right to choose. Nobody calls this natural instinct. It is connected to willpower and choice, apart from human nature. This choice may not be an option in many religions, since this departs away from human nature and human instinct. It is not a lateral choice. It tries to prune a natural branch and add a dried stick.
The Deen question is connected to main religions being the keepers of human instincts and collective human propensities. These things apply to all, with differences appearing in terms of how to integrate choice and will power, since that too comes from God. Some are more strict.