The oldest religion in the world is generally considered to be Hinduism. It has roots dating back more than 4,000 years, with its earliest scriptures, such as the Rigveda, composed around 1500 BCE or earlier. Hinduism is unique in that it has no single founder and developed as a fusion of various Indian cultures over millennia. It is often described as a "family of religions" due to its accommodating nature and diversity of beliefs and practices. Other ancient religions that are very old include Zoroastrianism, which may date back as far as 4,000 years and is considered the oldest monotheistic religion, and Judaism, with oral traditions that are nearly 4,000 years old and written texts dating back to the mid-2nd millennium BCE. However, Hinduism is usually recognized as the oldest continuously practiced religion with ancient scriptural texts.