One of the most often used tools by sickulars to attack Hinduism is to put a question mark on the existence and definition of Hindus. Their agenda is to prove to that Hinduism is the religion of Brahmins only, and all other castes of Hinduism are slaves of Brahmins, who must liberate themselves i.e. leave Hinduism and convert to other religions or just transform into a vibrant Hindu hater.
This scam was started by Evangelists with the invention of Aryan Invasion Theory, which got some support in Tamilnadu, causing some people to actually believe that South Indians belonged to a different race than North Indians. Evangelists wanted them to believe that the Rakshas (devils) in Ramayan, whom Lord Rama fought to rescue his wife Sita, were actually inhabitants of Tamilnadu, termed as Dravidians. Ramayan was converted into a story, rather myth, of fight between Aryans and Dravidians.
Evangelists had the state machinery of the British government to support them and a team of committed missionaries to propagate the theory, and it sold like hot cakes. Some people in Tamilnadu even cheerfully accepted Lanka King Ravana as the Dravidian hero, blissfully forgetting that Ravana was referred to as a Brahmin in most of the ancient versions of Ramayana. So even if the Aryan Invasion Theory was correct, Ravana was an Aryan!
Anyway, the issue is not to find out whom Lord Rama fought in those times, but to find out what the enemy of Hinduism is upto. Here, it would be very helpful to understand how Evangelists succeeded in converting whole of Europe into Christianity...