All these religions are actually part of the same body of religions called the Dharmic religions. In my opinion, Buddhism and Jainism are actually a part of Hinduism. It just so happened that this "sect" transformed itself into a separate religion after it hailed numerous followers. In fact, Buddhism and Jainism are offshoots of Brahmanical Hinduism.
All three believe in non-suffering
All three believe in the wheel of life and reincarnation
All three are called different but in reality the same
It is just like the Abrahamic religions- they are the same but are different in a way.
Buddhism,Jainism and Hinduism are same in some teaching or story and in basic idea just like
morality and concentration. completely difference
in Buddhism from other two is insight knowledge-
Vipassana meditation.
Their underlying metaphysical assertions are completely different. Whereas, the Jains believe that an effect or phenomena, contains within it its own result. They assert production from self and this is their philosophical basis for this things intrinsic existence or true establishment. The Hindus assert production from other - a creator, like Ishvara. This is how they defend their assertion of a things true establishment - that it is produced from other. I forget who thinks things are truly established because of production from BOTH self and other but it is the nihilists who feel that things are without cause - that a peacock has pretty feathers just because that is how it is. The Middle Way Consequence view is that all phenomena lack true establishment because they are dependently originated. While the Middle Way Autonomists and Mind Only schools believe that there is inherent existence in phenomena including the mind and mental factors. In the case of the Sutra School and Great Exposition School there is inherent existence in the self. If there are errors in this response it is due to my ignorance, but I am going to go look this up right now for my own personal edification. Thank you for asking this question and may all sentient beings share in the merit created by our conversation!
(1) All 3 have Indian origins
(2) All 3 believe in non-violence especially Jainism & Buddhism
(3) All 3 believe that animals also have rights i.e. right to live.
(4) All 3 believe in reincarnation after death as a rule.
(5) All 3 have the aim & purpose of life as nirvana / Misha i.e liberation from life & death & life cycle.
(6) All 3 believe in karma (deeds ) as the fundamental principle which moves every body.
(7) All three believe that karma (deeds) is the principle of action & reaction.
(8) All 3 believe that good karma (deeds) is the only way to get good fortune & bad karma brings misfortune.
(9) All three believe that meditation is the way to remove bad karma.
(10) All 3 believe that one need not enjoy in this world rather remain unattached to properties, wealth & relations as the worldly life is just a passing phase.
(11) Vegetarianism is very important in all three.
(12) All 3 believe in asceticism.
Often Hindutva bigots claim that Jainism and Buddhism are offshoots of Hinduism?..This is the biggest false hood. Jainism and Buddhism arose from the ancient Sramana tradition that had links with Indus Valley Civilisation. Sramanas were Prue-aryan and Prue-vedic renounce who propounded the doctrines of ? Karma, Jnana, Samsara, Moksa and Ahimsa as against the barbaric animal sacrifices of Vedics. Ultimately the ritualistic vedism adopted all the sramana concepts and gave way to the Upanishads.
Following is the testimony of the scholars:-
A. Dr. Vilas Sangave (2001) In : Facets of Jainology: Selected Research Papers on Jain Society, Religion, and Culture . Popular Prakashan: Mumbai ISBN 8171548393
?The jain communities is one of the very ancient communities of India. The existence of the Jain religion can not only be traced to the vedic period but even to the Indus valley period of the Indian History. The names of Jain Tirthankars are mentioned in the Vedas and there is evidence to show that the Indus valley people must be worshipping Rishabhdeva the first Tirthankar of the Jains along with the other deities. Thus Hoary antiquity is a special feature of the Jain community and it is pertinent to note that this feature is not present in other religious minorities in India.?
B. Mary Pat Fisher (1997) In : Living Religions: An Encyclopedia of the World's Faiths I.B.Tauris : London ISBN 1860641482
?The extreme antiquity of Jainism as a non-vedic, indigenous Indian religion is well documented. Ancient Hindu and Buddhist scriptures refer to Jainism as an existing tradition which began long before Mahavira.? Page 115
C. Joel Diederik Beversluis (2000) In: Sourcebook of the World's Religions: An Interfaith Guide to Religion and Spirituality, New World Library : Novato, CA ISBN 1577311213
Originating on the Indian sub-continent, Jainism is one of the oldest religion of its homeland and indeed the world having pre-historic origins before 3000 BCE, and before the propagation of Indo-Aryan culture?.Page 81
D. Dr. P.S. Jaini, (1979), The Jaina Path to Purification, Motilal Banarsidass, Delhi, p. 169
Jainas themselves have no memory of a time when they fell within the Vedic fold. Any theory that attempts to link the two traditions, moreover fails to appreciate rather unique and very non-vedic character of Jaina cosmology, soul theory, karmic doctrine and atheism.
E. Y. Masih (2000) In : A Comparative Study of Religions, Motilal Banarsidass Publ : Delhi, ISBN 8120808150
. ?There is no evidence to show that Jainsim and Buddhism ever subscribed to vedic sacrifices, vedic deities or caste. They are parallel or native religions of India and have contributed to much to the growth of even classical Hinduism of the present times.? Page 18
?We know only this much that the doctrine of karma-samsara-jnana-mukti is first seen in the clearest form in the shramanic tradition. It is now even accepted by orthodox bhramins. This doctrine is not clearly spelled out in Rgvedas and not even in the oldest parts of Upanishads called chandogya and Brhadaranyaka.? Page 149
F. Dr. A. N. Upadhye , A Cultural History of India, Clarendon Press, Oxford
"The origins of Jainism go back to the pre-historic times. They are to be sought in the fertile valley of Ganga, where they flourished in the past, even before the advent of Aryans with their priestly religion, a society of recluses who laid much stress on individual exertion, on practice of a code of morality and devotion to austerities, as means of attaining religious Summum Bonum." , P. 100
G. Robert J. Zydenbos
In the view of so many basic differences between the two traditions, [Jain and Vedic] it is amazing that there are still people who speak of Jainism as a ?heterodox sect of Hinduism? An Impartial study of the literary evidence, both Jaina and Brahamanical, leads to a conclusion that the latter offshoots of the vedic traditions (like Hinduism) have borrowed a lot from Jainism : the theory of karma and re-birth, the vegetarianism of the higher Hindu castes, perhaps also temple worship. Page 59
The similarities between the three religions mentioned in your question are that all three believe that a person must go through much suffering in order to reach A STATE OF (PEACE) !