Your comments are excellent..
“My belief is that the spirit world is in another dimension.”
Just as two or more TV channels can exist on the same cable at the same time and appear separate, so it is with Heaven. They are at different frequencies.
Heaven is right here, right now, but it exists at a different frequencies of consciousness. My Father’s Mansion has many rooms, each existing at a different frequency.
FYI
I remember Jacob's ladder where he saw angels coming and going into heaven. We are taught that Jesus is that ladder, but in reality, He controls the ladder. When Scriptures tell us that the heavens will roll back like a scroll, could it be saying that the barrier will dissolve between earth and heaven just as the veil was torn in the Temple to remove the barrier to God?