Answer from AVS:

Sree Parameshwara is the founder of Sanathana Dharma. 

Many philosophies, worship traditions, and religions existing today have a human founder.

Example:

Buddhism - Gautama Siddhartha Buddha

Jainism - Vardhamana Mahavira

Sikhism - Guru Nanak

Judaism - Prophets like Abraham and Moses

Christianity - It is widely believed that Jesus Christ is the founder of Christianity. However,

modern scholars and experts opine that modern Christianity is based on the

Pauline Church established in the name of Jesus by Saint Paul.