People misunderstand it as reincarnation but what he meant was discarding the old selfish self and taking on a new virtuous self and comes and goings is describing the daily struggle with our ‘demons’ our faults, At one time we become saintly then again we sin and drop down to our old self and it this struggle which is misinterpreted after 2,500 years to mean reincarnation.
Also, the Buddha said that eventually His true doctrine would disappear to be replaced with a counterfeit doctrine and that is these false beliefs and statue worship which Buddha never taught.
Just like Christians expect false prophets, Buddha spoke of a COUNTERFEIT religion in His name that would arise.
accesstoinsight.org/tipitaka/sn/sn16/sn16.013.than.html
Muslims too have been told their religion would die… This is from their OWN traditions not Bahai Books…
"The Apostle of God said: `There will come a time for my people when there will remain nothing of the Qur’an except its outward form and nothing of Islam except its name and they will call themselves by this name even though they are the people furthest from it. The mosques will be full of people but they will be empty of right guidance. The religious leaders (Fuqaha) of that day will be the most evil religious leaders under the heavens; sedition and dissension will go out from them and to them will it return.’ " -ibn Babuya, Thawab u - See more at:
al-qiyamah.org/#sthash.yTqFRrQV.dpuf