Christianity's "Great Commission"?

On page 270, of "The 5 gospels: what did Jesus really say" by Robert W. Funk "93", it says:

Quote:
"the great commission of Matt 28:18-20 has its counterpart in Luke 24:47-48 & Acts 1:8 (both Luke & Acts were written by the same author). John 20:22-23. These commissions have little in common, which indicates that they have been created by the individual evangelists to express their conception of the future of the Jesus movement. As a consequence, they cannot be traced back to Jesus."


On page 108, of "The Gospel of Jesus" "99" by Jesus Seminar Director & founder Robert W. Funk:

Quote:
"The Jesus Seminar concludes that approximately 85% of the words and actions of Jesus as reported in the New Testament are not authentic -- he never said or did most of those things."


500 years or so earlier the Buddha gave a similar commission to his own disciples. Then he addressed the monks:

Quote:
"Monks, I am free from all shackles whether human or divine. You too are free from all shackles whether human or divine. Go now and wander for the welfare and happiness of many, out of compassion for the world, for the benefit, welfare and happiness of gods and men. Teach the Dharma that is good in the beginning, good in the middle and good in the end, with the meaning and the letter. Explain a holy life that is utterly perfect and pure. There are beings with little dust in their eyes who will be lost through not hearing the Dharma. Some will understand the Dharma. I shall go to Uruvilva, to Senanigama, to teach the Dharma."

- The Life of the Buddha by Bhikkhu Nanamoli, p. 52, this passage taken from the Vinaya