YAHUWEH the Almighty Creator of heavens and the earth divided the people of the earth into two races namely: the righteous and the unrighteous race. 
The Righteous Race: also called "Yahudim" or "the elects" came from the seed of righteous Ab'El/Seth the son of Adam. 
The Unrighteous Race: also called "the world" or "the perverse generation" came from the seed of Cain; also the son of Adam. Both races came from Adam, the father of the whole people of the earth

In the matter of disobedience (sin) and obedience (qodeshness) YAHUWEH separated the two sons of Adam: (Cain and Ab'El) into two races, and strictly forbids the righteous race to mingle 1 Yh 2:15, nor intermarry the unrighteous race Ex 33: 16/ Deut 7:3-14, because YAHUWEH knows that in mixed fellowship, the unrighteous will lure the righteous into disobedience, and would cause the righteous to forsake His prescribed ways. For His righteousness sake, HE sets-apart His own people from the rest of the world Ex 19:5-6. Yahushua His anointed Messenger confirmed it when He said, "I do not come to bring peace on earth but a sword. For I have come to bring division; an adami (*man) against his father, a daughter against her mother, and a daughter-in-law against her mother-in-law, and an adami's enemies are those of his household" MatthYahu 10: 35.
Sin is more enticing and pleasurable than righteousness. Our nature is more inclined to sin than to do right, because we are all conceived in sin.
Subsequently, because of mixed fellowship between the righteous and the unrighteous YAHUWEH Almighty destroyed the earth with flood Gen 6:1-7. YAHUWEH abhors sin; a bad odor to Him, and would not tolerate disobedient of any kind. For that reason, HE commanded His people to be perfect as HE is perfect Gen 17:1/ Matt 5:48, and be set-apart onto Him. Likewise, YAHUWEH's Qodesh Spirit warned and said, "Come out from among them, unless you share-in their wrath."  

Who are the heavenly race or the righteous race

The heavenly race are called "Followers of Yahushua" or "Yahudim" meaning: elected race and worshipers of El, identified by the Name of YAHUWEH.
Note: Yahu - dim //  Yahu - is the abbreviation of YAHUWEH. 

The Yahudim are those YAHUWEH El chose from the foundation of the world- to know and worship Him in truth and in spirit. For that reason, HE gave them the privilege and authority to bear His Name Rev 14:1; a sign (mark) and indication of sonship Yahuchanan 1:12
A person of the race of Yahudim is called a Yahudi, meaning "a worshiper of YAHUWEH identified by His Name." 

The students (talmid) of Yahushua Messiah are the New Covenant Yahudim, called by the Name of YAHUWEH; following Yahushua wherever He leads them Rev 14:1

In 33 CE, after the resurrection of Yahushua the Messiah, whom the people of Yisra'El impaled on a tree, YAHUWEH rejected the nation of Yisra'El for rejecting His Word made flesh Deut 18:18-19/ Acts 3:22/ Yh 1:1-12 and created a New Covenant nation called by His own Name "New Yahusalem" mentioned in Rev 3:12/ Rev 21:1-2. HE also, sustained a New Covenant Race of people also called by His own Name as "Followers of Yahushua." 
The students (disciples) of Yahushua the Messiah are the New Covenant Yahudim Yh 8:31. As you well understood that the Name "Yahushua" means {YAHUWEH is my Savior, or YAH saves}. Thus, whoever receives the Name of Yahushua the Messiah and follow His commands wherever He leads Yh 1: 12/ Rev 14:4, is identified or called by the Name of YAHUWEH as "Yahudim." 

Note: Yisra'El means: the victorious princes of El. However, Yahudim are worshipers of YAHUWEH who overcame the pressure of this world by not following the ways of the world, either worship the deities of this world. 

Yisra'El = victorious or prevailed Gen 32:24-30, while the New Covenant Yahudim = overcame or defeat the influence and the pressure the world  Yh 17: 9-18/ Rev 3:12.  

The Spirit of YAHUWEH testified about Yahudim in Revelation 3:8 and said, "I know your work, see, I have set before they an open door, no one is able shut it; for you have little strength, yet have kept My Word, and have not denied My Name." See Yh 17:6. The Kodesh Spirit continued in Rev 3:12, "He who overcomes, I shall make him a pillar in the Temple of My El, and he shall by no means go out. And I shall write on him the Name of My El{YHWHRev 14:1/Rev 22:4} and the Name of the City of My El the New Yahusalem, which comes down out of heaven from My El, and My new Name." 

                What does it require to be a Yahudi or to be numbered among the heavenly race of YAHUWEH? 

Membership to the heavenly race is open to people of all nation, tribe, people, and colour; regardless of your ethnic background, for it is not in the heart of YAHUWEH Almighty that anyone perishes, but all to come to the truth, repent (by forsaking sin and the things of this world) and be saved. 

In the first Covenant, any foreign born or stranger who wishes to be a part of the Community of YAHUWEH must forsake the worship of the names of other deities, forsake his own people, and repent from his past sin, and be circumcised; a sign of Covenant with YAHUWEH. Furthermore, he must observe all the ordinances of YAHUWEH and keep His set-apart feasts, before he is numbered among the Community of YAHUWEH as Yahudi.

However, in the Renewed Covenant, anyone among the nations (the seed of Cain) - willing to forsake all the things of this present world; forsake father, mother, brothers, sisters, friends, houses, and all the traditions and system of this world, and repent from his sins; receiving the Name of YAHUWEH El and Yahushua His Anointed Messenger: will be initiated (grafted) into a new citizenship of New Yahusalem, into the Household of YAHUWEH - through water immersion in the designated Name of Yahushua the Messiah, for the forgiveness of his sin.
Note: Water immersion is a public denunciation of sin and the world, and a declaration of membership of the family of YAHUWEH (sons of El). 
Moreover, in returning to El, he must commit to worship just the Name of YAHUWEH, and follow Yahushua the Word of YAHUWEH wherever He leads; only then the person will be grafted a Yahudi or follower of Yahushua; numbered among the heavenly race of YAHUWEH Luke 14:26-33/ MatthYahu 19:26-29/ Acts 2:37-40/ Acts 4:32-37/Rev 14:1-5. Then, the next progression is been born-again to a new creation {convertion from darkness to marvelous light, from a person of disobedience into the son of obedience; from the nature of the wolf to the nature of a sheep. Messiah is the Shepherd}.  

YAHUWEH's Blessing for Yahudim: the people of His Name 

Deut 28:9-10

YAHUWEH does establish you as a set-apart {qodesh} people to Himself, as HE has sworn to you, if you guard the commands of YAHUWEH your El and walk in His ways. And all people of the earth shall see that you are called by the Name of YAHUWEH, and they shall be afraid of you.

YeshaYahu 43:1-7
But now, thus said YAHUWEH, your Creator, O Yacob, and He who formed you, O Yisra'El, "Do not fear, for I have redeemed you. I have called you by your name, you are Mine. When you pass through the waters, I am with you; and through rivers, they do not overflow you. When you walk through fire, you are not scorched, and a flame does not burn you. For I am YAHUWEH your El, the qodesh One of Yisra'El, your Savior; I gave Egypt for your ransom, Kush and Seba in your place. Since you were precious in My eyes, you have been esteemed, and I have loved you. And I give others in your place, and peoples for your life. Do not fear, for I am with you. I shall say to the north, Give them up! And to the south, 'Do not keep them back! Bring My sons from afar, and My daughters from the ends of the earth - all those who are called by My Name, whom I have created, formed, even made for My esteem. HE shall bring out a blind people who have eyes, and deaf ones who have ears. All the nations shall be assembled, and the people be gathered. Who among them declares this, and show us former events? Let them give their witnesses, to be declared right; or let them hear and say, It is truth. You are My witnesses, declared YAHUWEH, and My servants whom I have chosen, so thay you know and believe Me, and understand that I am He. Before Me there was no el formed, nor after Me there is none. I, I am YAHUWEH, besides Me there is no saviour

Acts 15:14
Simeon has declared how El first visited the nations to take out of them a people for His Name. And the words of the prophets agree with this, as it has been written: After this I shall return and rebuild the Tabernacle of David which has fallen down. And I shall rebuild its ruins, and I shall set it up, so that the remnant of adamkind (*mankind) shall seek YAHUWEH, even all the nations on whom My Name has been called, says YAHUWEH who is doing all this, who has made this known from of old.

To apostle Paul, the Almighty YAHUWEH had given the first initiative to make His Name known to the Gentile nation, saying: 
"But the Master said to him, "Go, for he is a chosen vessel of Mine to bear My Name before nations, kings, and the children of Yisra'El."Acts 9:15
Paul wrote in his letter to (1 Corninthians 3:10-11) "According to the favour of El which was given to me, as a wise master builder I have laid the foundation, and another builds on it. But each one should look how he builds on it. For other foundation can no man lay than that is laid, which is Yahushua {YAHUWEH is Savior} the Messiah."

2 Chronicles 7:14-16
If My people who are called by My Name shall humble themselves, and pray and seek My Face, and turn from their wicked ways; then will I hear from heaven, and will forgive their sins, and will heal their land. Now Mine eyes shall be open, and Mine ears attent unto the prayer that is made in this place. For now I have chosen and make special this house, that My Name may be there forever: and Mine eyes and Mine heart shall be there perpetually.   

Numbers 6:24-27
This is how those called by His Name shall receive their blessing: 
"YAHUWEH bless you and guard you; YAHUWEH make His Face shine upon you, and show you favour; YAHUWEH lift up His Face upon you, and give you peace."
Thus you shall put My Name on the children of Yisra'El {the overcoming princes of El}, and I Myself shall bless them.

Imprisoned for lack 
   of Knowledge
                                              Heavenly Race

Ruler of the Race :    YAHUWEH Almighty......... the Creator of universe 
Prince of the Race :   Yahushua Messiah .......... the Word and Son of YAHUWEH  
The Race :                  Yahudim .............................. people called by the Name of YAH  
Citizenship :               Yahusalem .......................... YAHUWEH Eternal City of peace
Language :                 Yahudah or Hebrew ......... the tongue of Garden of Eden
Tribes of the Race :     Yahudah - Reuben - Simeon - Levi   
                                     Yissakar - Yoseph - Naphtali - Gad    
                                     Zebulum - Asher - Benyamin - Dan
Rev 21:9-18 
Each of the tribes of the Race of Yahudim  has 12000 elects, which sums up to 144,000 elected citizens YAHUWEH Almighty had chosen from among the sons of Adam to be saved from the earth by Yahushua the Savior after the 7th day or 7000 years of trial and purification period of the people of the earth Dani'El 12:4-10/ Rev 14:1/ 7:4.