All Buddhist teachings can be traced back to the historical Buddha, Siddhartha Gautama, who lived in India two and half thousand years ago. All the teachings are based on the Four Noble Truths the Buddha taught in the first sermon following his Enlightenment: the recognition that every living being experiences sufferings; the understanding of the causes of this sufferings; and the path or methods by which to achieve Liberation from sufferings, or full Enlightenment.
The Buddhist Tantric teachings include methods for the purification of the psycho-physical components of human beings through meditation upon a pure being or deity, within a pure environment, or mandala. The deities who inhabit a mandala are not external gods; rather, they symbolize the Enlightened State, which everyone has the potential to realize.
Go to the Guhyasamaja section for more information