beej
"Question... if God is the "creator" why did he create Lucifer?"
For love. Like we want children. He was just the first of many.
Griz, I know you well enough to know that you must know, all too well, what it is to be the victim of jealousy from some one you love.
"Another question... if energy is neither created nor destroyed, but only changes form, in what form does our spirit (energy) exist after death?"
The breath of life is from God. It goes back to Him when you die.
"and yet another... does the way in which we live our lives affect whether, after death, we join Lucifer as "negative" energy, or "God" as positive energy?"
Ezekiel 28:17 Thine heart was lifted up because of thy beauty, thou hast corrupted thy wisdom by reason of thy brightness: I will cast thee to the ground,[this happened when God made the earth] I will lay thee before kings, that they may behold thee. [He rules this world]
:18 Thou hast defiled thy sanctuaries by the multitude of thine iniquities, by the iniquity of thy traffick; [KJV] therefore will I bring forth a fire from the midst of thee, it shall devour thee, and I will bing thee to ashes upon the earth in the sight of all them that behold thee.
:19 ...thou shalt be a terror, and never shalt thou be any more.
It's all about the bottom line.