1John 5:7-8 is spurious and was not in the originals [Metzger] As you should well know by now.
Secondlyly we have to deal with Micah 3:8; Psalms 104:30; Psalms 139:7; Job 34:14-15; and Luke 1:35. Christ also said," see my hands and my feet they are not spiritual.."
I never brought up 1 John 5:7-8 into this discussion. Someone brought it up in one of the threads I follow (I can't remember if it was in this thread or another one). However, I never use it in defense of the Trinity myself.
The truth of the Trinity does not rest on 1 John 5:7-8 in the KJV. There are many verses in the Bible that support the doctrine.
I don't see what Micah 3:8 has to do with this, nor with Psalm 104:30, nor with Psalm 139:7. All these mention the Holy Spirit....so all you're really showing is that the Holy Spirit is in the OT, and thereby pointing to His Deity and identity as YHWH. I don't think that's what you were meaning to show, but maybe it is?
However, Job 34:15-15 doesn't fit that, since that isn't really talking about the Holy Spirit, but it mentions the word "spirit."
Likewise, Luke 1:35 is talking about the Holy Spirit overshadowing Mary.
So...for almost all these verses, you are simply showing the deity of the Holy Spirit.
As for your quote regarding "Christ also said," see my hands and my feet they are not spiritual.."
That's taking the passage out of context and changing the meaning. I assume you are talking about Luke 24:39?
When reading this, keep in mind that this was after Jesus' resurrection...
This is what it says in context:
Luke 24:36-43 (NASB)
While they were telling these things, He Himself stood in their midst and said to them, "Peace be to you."
But they were startled and frightened and thought that they were seeing a spirit.
And He said to them, "Why are you troubled, and why do doubts arise in your hearts? See My hands and My feet, that it is I Myself; touch Me and see, for a spirit does not have flesh and bones as you see that I have."
And when He had said this, He showed them His hands and His feet.
While they still could not believe it because of their joy and amazement, He said to them, "Have you anything here to eat?"
They gave Him a piece of a broiled fish; and He took it and ate it before them.
Okay, so what is going on here? Like I said, this is after Jesus' resurrection. Jesus is in His resurrected body, which is the same body that He died in, but that has been changed to a different type. It's the type of body that Paul talks about in 1 Corinthians 15 -- it can't get sick and die. It can walk through walls, etc. It's still a human body, but has been changed in type to an immortal/resurrected body.
Jesus showed them His hands and feet, which still had the nail holes from the crucifixion. The disciples had thought that he was a ghost (spirit). He was telling them that he wasn't a ghost (spirit). He had a real, bodily, physical resurrection. His body was real.
He then ate food to prove it to them further.