Original sentence: By the 13th century, Hindustan emerged as a popular alternative name of India, meaning the "land of Hindus".Hinduism has been called the "oldest religion" in the world, It is "a fusion of Aryan and Dravidian cultures", which consist of many diverse traditions.It has diverse roots and no single founder.The word Hindu was taken by European languages from the Arabic term al-Hind,  and refers to the land of the people who live across the River Indus.This Arabic term was itself taken from the Persian term Hindū, which refers to all Indians
Edited sentence: A Hindu, as per definition, is an adherent of the spiritual practices, yoga, philosophies and scriptures of Hindu Dharma.But it cannot be denied that Hindu is a form of Sindhu.Hinduism has been called the "oldest religion" in the world, It has diverse roots and no single founder.Hindū Dharma or Hinduism is often referred by its practitioners as Sanātana Dharma, Vaidika Dharma or Vedic Tradition.It is the spiritual, philosophical, scientific and cultural system that originated in Bharatavarsha (Indian subcontinent), that is based on the Vedas and it is the oldest of all living religious traditions still practiced today.It needs to be realised that this change from S to H is common in Saurashtra where Sorath becomes Horath, Somnath becomes Homnath and so on.It should also be noted that as per Nirukta rules of grammar, in the Vedic language, replacement of S with H is permitted.The Pahlvi inscription of Shahpur II, uses 'S' in Shakastan and Tuxaristan.The form Hindu is therefore, likely to have come from Saurashtra.The inscriptions of Darius and Xerexes which describe India as Hi(n)du, also use the term 'Sugd' for Sogdiana.The theory says that 'Hindu' originated from the Persian practice of replacing 'S' with 'H'.The word hindhu is first mentioned in the Rigveda as a Sindu.This 'Sugd' should have become 'Hugd' as per this theory.This does not seem to be true is evident from the fact that Sindh has not become Hind and both Sindh and Hind exist in Persian as well as Arabic