Cheese has long been a part of the human diet, even before Luis Pasteur invented the process of sterilizing milk in the 19th century. Of course since then, cheese has been regularly made from pasteurized milk. Some cheese makers still adhere to the traditional method though. Their products are referred to as raw cheese.
Those who argue for the benefits of raw cheese say that while harmful microorganisms are removed when you pasteurize milk, beneficial ones are lost too. These friendly or useful bacteria are considered probiotic and can aid digestion. They also add a range of flavors and texture to the cheese. As for safety, they say that the cheese making process itself, as long as it is done under sanitary conditions, can reduce the risk of microbial contamination.