Protestantism

» Brian Tubbs - The Trinity Debate

In another thread, Migisi posted these thoughts and questions....

Do any other Jesus quotes command that one pray/baptise in the name of all three? I can't remember any. Help me out here. Nowhere in the Bible do I read of any of Jesus followers praying or baptizing people while calling upon the titles of Father, Son or Holy Ghost. I contend that this verse was later corrupted by the church to validate Trinity theology. I think the Father and Holy Ghost in this verse is an interpolation. I too suspect the canonization process.
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Note the use of the singular 'name' in the verse. If all three names were to be used, wouldn't it read plural - 'names'?
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The Son's name is Jesus. If you're using the names of the Father and the Holy Ghost too, what names do you use?? Do you pray "in the name of I AM THAT I AM" (the name God himself allegedly told to Moses)? I've never heard any clergy say this. If the Son and Father have names, what is the Holy Ghost's name?
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If all three personages are ONE God, why not just pray and baptize 'in the name of God' rather than the servant personna 'Jesus'? And why the need to identify each? Would the 'Father' and 'Holy Ghost' feel slighted? Or was that done as a compromise to please early church disciples who couldn't accept the Trinity theology.
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Is the Holy Ghost really a separate person having a unique identity, or is it the essence or 'spirit' of Jesus-IS-God?
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What about Deuteronomy 18:20 - "But the prophet, which shall presume to speak a word in my [God's] name, which I have not commanded him to speak, or that shall speak in the name of other gods [Son, Holy Ghost], even that prophet shall die."
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I know I've presented a lot of questions here. If you'd like to move this post to a new thread, I'm okay with that. But I would appreciate answers. Thanks ahead of time.