Quote:

So the Holy Ghost cannot dwell inside our spirits either.

There may be a semantics issue here, with the definition of the word "dwell."

Because "the Holy Ghost . . . is a personage of Spirit. Were it not so, the Holy Ghost could not dwell in us" (D&C 130:22).

Also, one or more unclean spirits seem to be able to "dwell" in a person (e.g. Mosiah 3:6, Luke 11:24-26, Mark 5:8-13).

Also, "Hereby know we that we dwell in him, and he in us, because he hath given us of his Spirit" (1 John 4:13).

Quote:

Spirits do not pass through other spirits. . . . The Holy Ghost . . . does communicate with our spirits. This is done by an angel of the Lord who stands beside each of us.

To "stand beside" must be figurative.

Because if every righteous member has 1 or 2 angels beside them, and if spirits can't occupy the same space, this creates a challenge when a large number of righteous members are physically packed very close to each other. For example: a large earthquake at the Conference Center causing tens of thousands of people to become lumped together in a huge mass. A righteous member at the center of the mass of people would still need access to his or her angel(s) for guidance(?).

(I suppose that another way one can get around this is if one believes that angelic bodies are significantly smaller than physical mortal bodies, but I don't know of any scriptures that support this.)

Also, when we pray to "Heavenly Father" and get an answer, it's not really "Heavenly Father," but an angel next to us who heard and answered our prayer? Why are we taught to pray, "Our Father in Heaven?" Why not "My Personal Angel?"

My own belief is that Heavenly Father hears and answers our prayers without the need for a middleman angel.

The medium by which Heavenly Father does so is mentioned in the following 2 quotes.

"To prepare men to receive revelation from the Holy Ghost, the Lord sends forth his Spirit--meaning the Light of Christ, the omnipresent Spirit" (Bruce R. McConkie, The Promised Messiah, 75).

"We also believe that God the Eternal Father is omnipresent. Now by that I might point out that since he is a personal being, he can be in only one place at one time; and yet from him emanates a divine substance or spirit which we term the Spirit of God, the Spirit of the Lord, or the Holy Spirit. That divine substance emanates from God to fill the immensity of space. It is through that divine spirit that he performs his great work. Also, it is through that divine Spirit that he is omnipresent" (Milton R. Hunter, Conference Report, October 1948, 17).