People keep saying that there are no gods in Buddhism, but in actuality the Vedic gods have been part of Buddhism from the beginning. The earliest record we have of what the Buddha said and did is the Pali Canon. In the Samyutta Nikaya (Connected Discourses) there are large sections devoted just to conversations between the Buddha and the Vedic gods. In one, it is recounted how after his enlightenment the Buddha considered not teaching the Dharma (or Dhamma in Pali) as he was afraid no one would understand or want to give up their selfish craving. Brahma (the Vedic creator god) heard this and the following is from SN Chapter 6 story 1 in subchapter 1:
Then Brahma Sahampati, having known with his own mind the reflection in the Blessed One’s mind, thought: “Alas, the world is lost! Alas, the world is to perish, in that the mind of the Tathagata, the Arahant, the Perfectly Enlightened One, inclines to living at ease, not to teaching the Dhamma.” Then just as quickly as a strong man might extend his drawn-in-arm or draw in his extend arm, Brahma Sahampati disappeared from the brahma world and reappeared before the Blessed One. He arranged his upper robe over one shoulder, knelt down with his right knee on the ground, raised his joined hands in reverential salute towards the Blessed One, and said to him: “Venerable sir, let the Blessed One teach the Dhamma; let the Fortunate One teach the Dhamma. There are beings with little dust in their eyes who are falling away because they do not hear the Dhamma. There will be those who will understand the Dhamma.” (p. 232 of the Connected Discourses translated by Bhikkhu Bodhi)
So the Vedic gods were not added in later to Buddhism or by Tibetan Bon or anything of the kind. They are very present even in the earliest form of the canon. Also, this is not the only place where god the creator appears in human form like this. Look in Genesis where God visits Abraham (chapter 18).