I would say that whatever role Christ has in eternity, a few Orientals do get to an end point as nirvana independent of material Christianity. Christ described his role as overseer of the spirit world, which could include some spirit world influences in the oriental religions. For example, A significant error of the enlightenment religions is the assumption that a more perfect truth can be known through intuition when enlightened than can be known through acquisition of knowledge which is subject to reason. That assumption is wrong. When reality is acquired by feel without logic, the feel-good reality is always tainted by motives including forces of corruption.
Sin is what feels good to corrupted persons.
Logic defines objective reality. There is no other test for truth than logic. Christ created the foundations for deriving truth through objective reality.