Hi Shaun
Yes, I believe the Jataka Tales were made up later on, but like any folk tales, they can still have good messages in them that are not particular to the Buddha’s teaching.
Firstly I have not found RE-births, punna-jāti in the Pāli texts at all. So that would be an interpretation of some Pāli word. For there to be RE-birth, it would mean there is something from the first birth that can be identified with the second birth and that seems to be getting close to the soul theory.
For me, in the Buddha’s teaching, life only happens once for each person. It is the arising persistence and passing of the Five Aggregates (self) and would last about 80 years. There are many lives, in the sense that many people have lived throughout history and it is out of compassion for myself and future generations that I try to end greed (which destroys the environment), hatred (which leads to abuse of others) and ignorance (the first cause of the rest).
Birth, in the Buddha’s teaching as I understand it,is psychological, not physical and it is suffering because it is the birth of a particular combination of the Five CLINGING Aggregates (ego/soul idea…). This occurs many times within one lifetime and there can be overlapping ones and they can last for decades. E.g. I can identify as Christian and Australian from a very young age till the end of my life.
It (birth) happens when identity view takes hold based on the ‘I am’ conceit. One identifies with one of the Five Aggregates and then they become the Five Clinging Aggregates. They are verbalised as identity statements such as:
I am fat (form)
I am hot (sensation)
I am Buddhist (idea)
I am angry (emotion)
I am one with the universe (awareness).
Seen rightly, I believe the noble disciple would rather think/say:
My body is fat/I have extra weight
I feel hot
I believe the Buddha freed himself from conditioning (etc)
I feel angry
This is perception of unlimited consciousness.
I hope I have explained my ideas clearly.
best wishes