His death on that cross can be of value to us because He is the truth. Christ is man, from a spiritual point of view, because He is spiritually like Adam was when he, the first man, came into existence. But Christ never became untrue as Adam did. He is the way to heavenly glory, because He is true in all God's judgment as our Head. Therefore He is also life for us.
Death closes the way to heavenly glory and opens it to hell.
But Christ is our way because He is truth and life. All our trust of salvation must be in Him. We, therefore, must take hold of that truth wherewith Jesus began this chapter of John. I go to prepare a place for you. Put your trust then in Him.