Also, you need to read all of Acts 7. It doesn't say what you said it says: http://biblehub.com/acts/7-55.htm
But Stephen, full of the Holy Spirit, looked up to heaven and saw the glory of God, and Jesus standing at the right hand of God.
Check out Acts 7:56 for even more clarification:
and said, "Behold, I see the heavens opened, and the Son of Man standing at the right hand of God!"
Spirits don't have right and left sides, do they? Wait, before you dig the hole deeper by saying it's just figurative see Rev. 3:21. Don't even start on the "it's an honorific" track.
http://biblehub.com/interlinear/revelation/3-21.htm
That also hits the full heirship part that Christians can expect.
Clement's spot on about eternity. You can imagine becoming eternal, then you too will have no beginning, right?
You'll need to be more specific about what is or isn't the Trinity. Your exposition doesn't clarify anything, really.
How about a mathematical proof:
A. Heavenly Father = Jesus Christ = the Holy Ghost
or
B. Heavenly Father ≠ Jesus Christ ≠ the Holy Ghost
or
C. It's a mystery.
Pick one.
No, the "mathematical proof" actually works against the common "one God in the Bible"...
1010...read all those verses in Isaiah 43, Isaiah 44, Isaiah 45 where the God of the Bible doesn't know of any other God...that there's NO God beside Him
The Mormon "math" assessment is:
1 + 1 + 1 = 3
[plus when you include Mom-God, the "Ultimate Mormon god" who appointed Elohim to become a god, the "council of gods," other possible Mormon goddess-wives, and then all those Mormons who become gods, you've got more than just "3"...]
The real Math reality is: