Our belief in moksha is very ancient existing years before the christian era...Moksha is a pre-Aryna concept found in Sramana culture and later got assimilated in the Upanishads .
"Over time, apparent misunderstandings have arisen over the origins of Jainism and relationship with its sister religions of Hinduism and Buddhism. There has been an ongoing debate between Jainism and Vedic Hinduism as to which revelation preceded the other. What is historically known is that there was a tradition along with Vedic Hinduism known as Sramana Dharma. Essentially, the Sramana tradition included it its fold, the Jain and Buddhist traditions, which disagreed with the eternality of the Vedas, the needs for ritual sacrifices and the supremacy of the Brahmins."