Interesting that Christ said, to an audience composed exclusively of believing Jews, "No one comes to the Father except thru me."
Christ made it quite clear that it was not possible for a human to follow the Law and earn salvation that way. That is exactly why he came. When he did, the old covenant with the Jews was replaced with a new improved model to which all men have access, including the Jews.
Absolutely. But as I recall under Jewish Law sins are not forgiven, but merely rolled over until the next sacrifice.
Sadly I once heard Billy Graham, on the Larry King Show, say that he thought there were many paths to God. Larry was grilling him with the same questions that are in this thread.