Something To Ponder Upon

About Jerusalem parallel to the Jews in Zechariah 8:23

If they are wrong in rejecting the Greek book – New Testament, Jesus and the 3-in-1 G-d, why these verses and chapters exist? And not the opposite?

“Jerusalem”

Strengthen weak hands and give support to failing knees.
35:3
Say to those of impatient heart, ‘Be strong; do not fear. Behold, your God will come with revenge, with Divine retribution; He will come and save you.’
:4
A path and a road will be there; it will be called ‘The Road of Holiness,’ and no impure person will traverse it. It will be for them; the wayfarer, even ignorant ones, will not go astray [there].
:8
Then the redeemed of Hashem will return and come to Zion with glad song, with eternal gladness on their heads. They will attain joy and gladness, and sadness and sighing will flee.
:10

1 Desert and wasteland shall rejoice over them, and the plain shall rejoice and shall blossom like a rose.
2 It shall blossom and rejoice, even to rejoice and to sing; the glory of the Lebanon has been given to her, the beauty of the Karmel and the Sharon; they shall see the glory of the Lord, the beauty of our God.
3 Strengthen weak hands, and make firm tottering knees.
4 Say to the hasty of heart, “Be strong, do not fear; behold our God, [with] vengeance He shall come, the recompense of God, that shall come and save you.
5 Then the eyes of the blind shall be opened, and the ears of the deaf shall be unstopped.
6 Then the lame shall skip like a hart, and the tongue of the mute shall sing, for water has broken out in the desert and streams in the plain.
7 And the dry place shall become a pool, and the thirsty place [shall become] springs of water; in the habitat of jackals, a resting place, a grassy place for reeds and rushes.
8 And there shall be a highway and a road, and it shall be called the holy way; no unclean one shall traverse it, and it shall be for them; the traveler, even fools shall not go astray therein.
9 No lion shall be there, nor shall a profligate beast ascend thereon, it shall not be found there; and the redeemed ones shall go.
10 And the redeemed of Zion shall return, and they shall come to Zion with song, with joy of days of yore shall be upon their heads; they shall achieve gladness and joy, and sadness and sighing shall flee.