So obviously the difference is in the practice of the Christian faith that Christ is the only via-medium and only representative and son of God, whereas in the Vedic culture, there are more than just the one via-medium.
That's a very important distinction. Christ claimed to be the only path to God the Father. As second person of the Trinity, he was present at the creation of the world "in the beginning." Chapter 1 of the book of John says he "was the Word and the Word was with God and the Word was God ... and the Word became flesh and dwelt here among us." No other religious leader has made that claim.
Bottom line: Christ claimed to be the only way man can reach God. If that's true, then all other religions are false paths. If it's not true, then Christianity is a false path.
It's a matter of interpretation.