In the name of allah, the Beneficent, the Merciful What is sin in Islam?

We read in the Qur'an: “ Allah has forbidden you what dies of itself (Maytata), and blood, and the flesh of swine, and that which is slaughtered as a sacrifice over which any other name than that of Allah has been invoked(or has been slaughtered for idols, etc., 0n which Allah Name has not been mentioned while slaughtered). But whoever is driven by necessity, without neither willful disobedience nor transgressing due limits, then he is guiltless. Surely Allah is Oft-forgiving, merciful.” (2: 173).
2. To make the meat Halal, we have to consider not only the way the animal is slaughtered, but also we have to take in consideration what the animal was fed on, the food (the animal feed) the animal consumes does not contain any blood or meat (mammal feed a meat by-products). The animal has to be herbivorous to be Halal, and an animal becomes Haram if it consumes blood and /or meat (mammal feed). If this is not respected, "that animal will contain the disease called Mad Cow Disease, BSE or the others". Islam dictates that if an animal has received meat, (meat byproducts, mammal) and/or blood feed while it was Halal (before slaughtering), it becomes Haram and in order to become Halal you have to put that animal in a quarantine area before you slaughter it to make it Halal,. "Jallalah" are the animals (camel, cow, sheep, chicken etc.) that live near the dunghills or filth dumps. Most of their food is "jullah" i.e. excrements, filth, dead animals and like. Such animals smell bad. Their meat, milk and even the sweat stink. There are a number of Ahadith of the Prophet in which it is reported that the Prophet -peace be upon him- forbade eating the meat, drinking the milk or even riding the Jallalah animals. It is forbidden to offer such animals in sacrifice during Hajj and during the Eidul Adha. Jallalah refers to a permissible to eat animal but it eats the waste or flesh of other animals, such as camels, cows, sheep, chickens, geese, and so on.

Nowadays, generally, the animals are raised and fed, on animal protein and animal by-products derived from pigs, cows, dogs, cats and all other road kills animals. So today , if we are not eating organic meat and animal product food naturaliy, then eating Jallalah, which is haram according to the Islamic rules.