Reestablishing Buddhism

Dhamma, means phenomenon/way or "what it should be, when you live".
Buddhadhamma or Buddhism means The way taught by Buddha, which are 4:
1. There is suffering.
2. There is origin of suffering.
3. There is cessation of suffering.
4. There is a way that lead to cessation of suffering.
Buddha taught to practice Dhamma in Noble Eightfold Path:
1. Perfect View.
2. Perfect Thinking.
3. Perfect Speech.
4. Perfect Activity.
5. Perfect Livelihood.
6. Perfect Effort.
7. Perfect Notifying.
8. Perfect Concentration.

The disciples of Buddha then conceptualize this Dhamma through three vehicles:
1. The small vehicle (inward, to strenghtening self purification), by Mahakassapa. The schools are theravada, etc.
2. The middle vehicle (Dhamma) by Nagarjuna. The schools are White Lotus, Tiendai, etc.
3. The big vehicle (outward, to serve people) by Mahadewa. The schools are mahayana, vajrayana, zen, etc.

We know what is Dhamma (4 truths and 8 practices). But to LEARN DHAMMA, UNLEARN DHAMMA, AND FINALLY WITHOUT ANY MIND AND BODY/NIBBANA is the goal. Three characters of Nibbana are Sunnata (without forms), Animitta (without signs of becomings), and Appanihita (without desires).

Your mind is your world, your belief is your religion, three jewels are your protector.
However when Buddha about to die, Ananda asked, "who will substitute you as a teacher of Dhamma", Buddha said, "I will not appoint anyone as qualified enough to be like me. Everything changes, so just do necessary (appamada) thing. Having Dhamma as the guide you make yourself as the island."
Theravada was not made by Buddha, Abhidhamma and all its classifications just discussion of elder monks, not work or words of the Buddha.
Appamada means "necessary things" (no need to add more work like drawing various mandalas, etc).

Related article:
The Rise of White Lotus