TT, you will find that Christian translations tend to be self-serving in that they choose to translate one word in different ways to best "proof text" their theology.   They will translate a word correctly most of the time but then use a totally different meaning in places they think they can make something fit their religion.  Take 1 Samuel 16:14:
And the spirit of  HaShem departed from Saul, and an evil spirit from HaShem frightened him.
So why don't the Christians have a quadinity instead of a trinity?  Obviously there is a 4th aspect to their god -- an evil spirit as well as a holy spirit.

If not, why not?   It is the same usage as the good spirit!

There is nothing in the Jewish bible that infers there is a separate entity of G-d called the "holy spirit" -- and it is up to them to prove that there IS -- not for you to prove a negative (something that IS NOT THERE).

There is copious proof, however, that G-d is ONE and not three.   You might want to read Is the Trinity found in the Torah

Over and over again the T'nach makes it clear that G-d is ONE and that He has no son.  Further is does not SHARE His glory with any others.
Remember the first things of old, that I am G-d and there is no other; I am G-d and there is none like Me. Isaiah 46:9
If there are none like Him then how can Christians insist that one who appeared to be a man, even to the point of being born human, could possibly be G-d?  Being a man would make G-d like other humans -- something He tells us He is NOT.

Quote:
Deuteronomy 32:39, See now that I myself am He! There is no god except Me . .

This is His name forever.

This shows clearly that G-d will NEVER be a man.

And lest you have any doubts left:

Quote:
"I am HaShem; that is my name; and my glory will I not give to another" (Isaiah 42:7).

G-d is the Supreme Being, and there is none other besides Him! Deuteronomy 4:35

HaShem, He is G-d in heaven above and on the earth below; there is no other! Deuteronomy 4:39

There is none beside You; neither is there any Rock like our G-d. 1 Samuel 2:2

You alone, O L-rd, are G-d 2 Kings 19:19

Before Me no god was formed, nor will there be one after Me. I, even I, am HaShem, and besides Me there is no Savior. Isaiah 43:11


You might also want to remind one who insists Jsus is G-d in the following:

Quote:
Do not put your trust in princes, nor in the son of man, in whom there is no salvation! (Psalm 146:3)


Time and time again the GT says Jsus is the "son of man." G-d tells you not to trust him, because in him there is no salvation.

So to recap:

1. G-d is not a man

2. G-d is not a son of man

3. Do not put your faith in the son of man -- there is no salvation

4. G-d is unchanging He is as He always was and will be

5. Do not add to or subtract from Torah (Deuteronomy 4) -- saying G-d can be a man or a son of man and that He can change into a man at some point in the future

6.  One means ONE.

סופי

And everything that Sarah tells you, listen to her voice. Bereshit (Genesis) 21:12