In a recent study of the sacrament, I noticed that we make our promises that [we] may also have His spirit to be with [us]. With “His” referring to the savior, is this referencing the spirit or light of Christ? If not, how does this refer to the Holy Ghost as the Savior’s spirit? LDS.org states: the Light of Christ is sometimes called the Spirit of the Lord, the Spirit of God, the Spirit of Christ, or the Light of Life.
You are right. I will expound on some scriptures for you to help you get a really good grasp on this.
In 3 Nephi 11, the Resurrected Lord is visiting the Nephites and discussing the order and manner of baptism. As Christ expounded on his doctrine he states:
32And this is my doctrine, and it is the doctrine which the Father hath given unto me; and I bear record of the Father, and the Father beareth record of me, and the Holy Ghost beareth record of the Father and me; and I bear record that the Father commandeth all men, everywhere, to repent and believe in me.
The Holy Ghost bears record of the Father and the Son… as they are all one in the Godhead and one in purpose.
What purpose? Moses 1:39
For behold, this is my work and my glory – to bring to pass the immortality and eternal life of man.
Also, have you noticed the slight difference in wording between the Sacramental prayers for the bread and water? For the bread, we read that “they are willing to take upon them the name of thy Son”. For the water, we read that “that they do always remember Him”.
We are willing to take upon ourselves His name, and that we do always remember Him.
Hope this helps.