In order to understand Maha Dharma one should try to define what Hindu Dharma is. Hindu Dharma is the oldest religion in the world. The sub-religions like Buddhism, Jainism and Sikhism has evolved from Hinduism. It has been further divided into various sects like Shiv-ism, Shakti-ism, Vishnu-ism, Swaminarayan-ism and a new sect which has been in existence for around last fifty years called Krishna Consciousness. Hindu Dharma is ancient, hence Sanatan. The devotees of Maha Dharma strongly believe this to be the root of the giant tree of Hindu religion.
What is Hindu religion? The subject itself is as vast as the universe which has no cosmic boundaries. How can it be explained to non-Hindus? – Lord Krishna has given us various theories in Shrimad Bhagwad Geeta and our Mahatmas, Spiritual Masters, Scholars and Scriptures have come up with different schools of thoughts.
To me, Ajanma (unborn) Shiv-tatva (or immanent life force) through its own Echchha-shakti (will power) instigated three energetic facets which might be termed Creation, Survival and Destruction. We could personalise this analogy by calling Brahma, Vishnu and Mahesh (Shiva) as individual managers in charge of organising their own domains – Brahma creates, Vishnu maintains life while Mahesh keeps the balance of nature by destruction.