The Trinity and all of its supporting doctrines are all circular in reasoning

[Runningman]

duh. God indeed possesses the qualities of God. You learn something new every day.

If you recognize Greek scholars have done the work, then quote those scholars views.

You didn't take into account that the Word is not The God. So your point doesn't make any sense that the word would be God in the same sense The God is. Meaning, the Word isn't God hence why John doesn't believe the Word is God in 1 John 1:1-3 and Acts 4:23-31. You misunderstand Scripture, reject the explicit and clear in exchange for the unevidenced.

 

[Runningman]

oops. Here si the better version of Acts 20:28 (KJV)
Take heed therefore unto yourselves, and to all the flock, over the which the Holy Ghost hath made you overseers, to feed the church of God, which he hath purchased with his own blood.
The excuses used by unitarians to dismiss that have mostly to do with the natural way of preaching what Jesus said while being incarnate. That is the part that throws unitarians off so much. It never has been the central message to say "follow Jesus because he is the Word incarnate." But the unitarian pretends the message should be that or nothing.

Note. I did mention earlier --
However, that is a good question regarding a reason for John using the given approach. That is what led to recognition of the cultural context of Philo and Greek Philosophy. The gospel starts with what both Jew and gentiles were familiar with.

This is a misunderstanding of the context again. The CEV, among others, say "the blood of His own son" or just "the blood of his own" with the inference being his own [son] not the blood of himself. God doesn't have blood, he isn't a human with blood.

Acts 20
28Look after yourselves and everyone the Holy Spirit has placed in your care. Be like shepherds to God's church. It is the flock he bought with the blood of his own Son.+

Several Bibles that don't explicitly say "his own son" often have a footnote or a little commentary about how that's the meaning. They had to be honest so they had to put it somewhere. Real scholars and translators are kept accountable.

This verse makes it clearer:

Revelation 5
9And they sang a new song:
“Worthy are You to take the scroll and open its seals,
because You were slain,
and by Your blood You purchased for God
those from every tribe and tongue and people and nation.