Western Buddhist teachers all too often seem to find it necessary to apologize for rebirth, I guess in an effort to appease the religion of modernity, namely, big science. But this attitude only demonstrates a willingness to misrepresent Buddhism rather than accept the fact, based on the canon, that rebirth is at the heart of Buddhism and only ends when nirvana is attained.
Some teachers even go so far as to suggest that Buddhism is scientific (in the Western sense of the term) and that rebirth was just a concession by the Buddha to the spirit of the time because at that period it was an accepted and established popular view. Be that as it may, the idea of rebirth does not appear infrequently in the canon. There is no reason to dismiss it as trivial.
In some of my blogs on this particular subject, I have made it clear that consciousness (vijñāna) and not the ātman is the transmigrant. Further proof can be found in O. H. de A. Wijesekera’s paper, The Concept of Viññāṇa in Theravāda Buddhism. Wijesekera observes:
"In view of the evidence the conclusion is difficult to avoid that the term viññāna [consciousness] in Early Buddhism indicated the surviving factor of an individual which by re-entering womb after womb (gabbha gabbham: Sn. 278, cp. D.iii.147) produced repeated births resulting in what is generally known as Samsara."
Nowhere has the Buddha taught that there is no transmigration from one life to the next. He basically tells Ananda in the Mahānidāna Sutta that in order to have birth, aging, death and suffering consciousness must find a resting place in the embryo (nāma-rūpa) otherwise there would be no birth, aging, death and suffering.
It is only in recent, modern history with its strong bias towards materialism that we find Buddhists, who are skeptical of the Buddha’s teachings on rebirth, who in order to make a living, have to sell intractable materialists on Buddhism without rebirth.