Hi, not good at web dialog,
plus I have a huge migraine today, but wanted to answer your query with some info. I looked up. Hope this helps.
…
But now the trinitarians will say Thomas used the Greek definite article “the” (ho) before “God,” proving he called Jesus The God. The article “the” is in the nominative case in the Greek, but the word “God” here is in the vocative case and of such A. T. Robertson says in his A Grammar of the Greek New Testament in the Light of Historical Research, on page 461: “The article with the vocative in address was the usual Hebrew and Aramaic idiom, as indeed in Aristophanes we have ho pais akoloúthei. It is good Greek and good Aramaic too when we have Abbá ho patér (Mark 14:36) whether Jesus said one or both. In Matthew 11:26 (nai, ho patér) we have the vocative. When the article is used, of course the nominative form must occur. Thus in Rev. 18:20 we have both together, ourané kai hoi hágioi. Indeed the second member of the address is always in the nominative form. Thus Kýrie, ho Theós, ho pantokrátor (Rev. 15:3). Compare John 20:28.” Page 462: “When Thomas said Ho kýrios mou kai ho theós mou (John 20:28), he gave Christ full acceptance of his deity and of the fact of his resurrection.” Page 466: “In John 20:28 Thomas addresses Jesus as ho kýrios mou kai ho theós, the vocative like those above. …
So, since the use of the definite article was made before the form of address to anybody, Thomas’ use of the definite article does not force his use of God to mean The God, Jehovah. Jehovah was not begotten, but existed without beginning. But according to John 1:18 (NW) Christ was the only god or strong one directly begotten or created by Jehovah, however.
So Jehovah is The God; Jesus Christ is one of many who are called gods. Satan is called “the god of this system of things,” Not all that good at Greek either I see. The verse reads as follows:
απεκριθη θωμας και ειπεν αυτω· ὁ κυριος μου και ὁ θεος μου. λεγει αυτω ὁ ιησους· ὁτι εωρακας με πεπιστευκας. μακαριοι οἱ μη ιδοντες και πιστευσαντες. and in Latin, 28 respondit Thomas et dixit ei Dominus meus et Deus meus (Yeah, you picked the wrong guy to bring up this passage with.

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There is no way that this is an exclamation as these were Jews and would have been blasphemy had that been the case, but the fact is that Thomas is confessing his personal belief that Jesus is indeed God in the flesh. Not a god, like you have errantly asserted.
Watchtower didn’t know what they were talking about in 1955 and they still don’t know what they are talking about today. If that offends you two then I’m sorry, but it’s a verifiable fact. The early church all believed that Jesus was fully God and fully man and it’s hard to see how you can even attempt to assert anything else in the light of this plain statement of scripture, to say nothing of this. "8: See to it that no one makes a prey of you by philosophy and empty deceit, according to human tradition, according to the elemental spirits of the universe, and not according to Christ.
9: For in him the whole fullness of deity dwells bodily, "
Verse 8 would also seem to apply to this situation here as well.
BTW, Before you guys decide that this is a good platform for your evangelism I really suggest that you carefully read the
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