"And, If you set the end from the beginning, why even interact or be a part of anything or any of it with us or interfere or ever intervene at all...?"
We have a creator God. God is love ... it's not just something He does it is what He is. Try to comprehend that. Love is the height of His character/being. Who He is.
1 John 4
New American Standard Bible
The one who does not love does not know God, for
God is love.
So, He likes to create things and He is Love. The evidence of love requires more than one. To give love and to receive love takes more than one. True love also requires free will. One can not make (force) someone love another ... true love must be through freewill. The will (of God) to give love and will (of mankind) return it.
1 John 4
King James Bible
19 We love him, because he first loved us.
Agape Love -
"to will the good of another." especially charity ....
the love of God for man and of man for a good God...
used to express the unconditional love of God for his
children.
God is very relationship oriented ... family. He created beings ultimately to be one HUGE loving family for eternity and to provide an environment filled entirely with love and creations for them to enjoy and learn about.
"Of course then maybe He wanted to be a part of it,"
John 17
Aramaic Bible in Plain English
21 “That they all shall be one, just as you, my Father, are in me, and I am in you, so that they also shall be one in us. “
This is what it is about, all His created beings being one with Him just as Jesus is. More than "part" .... ONE.
'but then why does He show Himself first to us as what He was like and how He did in the OT...?"
He did show Himself to mankind and what happened? You think anything would be different now.? Of course not.
Also, protection for us. Satan will show himself as an angel of light and will deceive many.
2nd Corinthians
14
And no wonder, for Satan himself masquerades as an angel of light.
God Bless.