Before Abraham "WAS, I AM". So what does this mean? Jesus took this name onto himself and it means, God! This is why people picked up stones to try and stone Jesus for him proclaiming he was God! Now, did God die (Jesus) since you said, "Christ WAS part of the Godhead......." Was is past tense. Jesus "IS" God and he IS part of the Godhead and always has been, always will be and is now! This verse is speaking of the end times when Jesus will be King of this Earth, everything will be put under his feet; when everything has been summed up. I do think you have read something into these scripture verses that aren't really there. Since Jesus is omnipresent, then yes, all things are subdued unto him forever, and ever. It continues for eternity and always will. Was there ever a time when Jesus was not God?Yes, Christ was part of the Godhead prior to the earth's creation. I am referring to this scripture:
1Cr 15:27-28 For he hath put all things under his feet. But when he saith all things are put under him, it is manifest that he is excepted, which did put all things under him. And when all things shall be subdued unto him, then shall the Son also himself be subject unto him that put all things under him, that God may be all in all.
Clearly, there was a point that "all things" were subdued unto Christ...such as death.
When do you think this happened? Or do you think it was this way from eternity to eternity and that things were never subdued unto him?