So fully putting that Buddists and Jains are responsible is not fully supported by History.
Secondly Buddhism and Jainism are not Different Religions to say. They are Developments of Reformations, as a branch of Hinduism, as Protestants to Christinaity. 20th Century Cunning Missionary Minded Indologists divide and called it that way.
For Rrk- friend Vupanishads have Argued all positions including Atheistic
Personally I believe more Agnostic, and with Para Sciences proving Repeated Births, I Trust Karma Theory is scientific.
Man as a Mammal was made Vegetarian
Hence Vegetarian is not only Theistic, but Scientific