Hi Mary, the Bible identifies the faith beyond any doubt, and it is rather easy to see.
Just as you stated there are over 2 billion who claim to be Christian at this time, however most of those are not in the one faith as you likely recognize, but are distributed over thousands of sects teaching their own doctrine. Jesus said Christians would be recognized by their fruits, so after you personally determine which faith is God's people, then see the number of adherents of that faith maam.
Would you like to go through some passages that identify God's people?
give us you’re creed
ours is these
The Apostles Creed!
I believe in one God, the Father almighty,
creator of heaven and earth.
And in Jesus Christ, his only Son, our Lord, who was conceived by the Holy Spirit and born of the virgin Mary. He suffered under Pontius Pilate, was crucified, died, and was buried; he descended to hell. The third day he rose again from the dead. He ascended to heaven and is seated at the right hand of God the Father almighty. From there he will come to judge the living and the dead. I believe in the Holy Spirit, the holy catholic church, the communion of saints, the forgiveness of sins, the resurrection of the body, and the life everlasting. Amen.
Nicene Creed!
We believe in one God, the Father almighty, maker of heaven and earth, of all things visible and invisible. And in one Lord Jesus Christ, the only Son of God,
begotten from the Father before all ages,
God from God, Light from Light, true God from true God, begotten, not made; one in being with the Father. Through him all things were made. For us and for our salvation he came down from heaven; he became incarnate by the Holy Spirit and born of the virgin Mary, and was made man. He was crucified for us under Pontius Pilate; he suffered and was buried. The third day he rose again, according to the Scriptures. He ascended to heaven and is seated at the right hand of the Father. He will come again with glory to judge the living and the dead. His kingdom will never end.
And we believe in the Holy Spirit, the Lord, the giver of life. He proceeds from the Father and the Son, and with the Father and the Son is worshiped and glorified. He spoke through the prophets.
We believe in one holy catholic and apostolic church. We affirm one baptism for the forgiveness of sins. We look forward to the resurrection of the dead,
and to life in the world to come. Amen.
and
Athanasius Creed!
(From the early church)
Whoever desires to be saved must above all hold to the catholic faith.
Anyone who does not keep it whole and entire will doubtless perish eternally.
Now this is the catholic faith:
That we worship one God in trinity and the trinity in unity, neither blending their persons nor dividing their essence. For the person of the Father is a distinct person, the person of the Son is another,
and that of the Holy Spirit still another.
But the divinity of the Father, Son, and Holy Spirit is one, their glory equal, their majesty coeternal.
What quality the Father has, the Son has, and the Holy Spirit has. The Father is uncreated, the Son is uncreated, the Holy Spirit is uncreated.
The Father is immeasurable, the Son is immeasurable, the Holy Spirit is immeasurable.
The Father is eternal, the Son is eternal,
the Holy Spirit is eternal.
And yet there are not three eternal beings; there is but one eternal being.
So too there are not three uncreated or immeasurable beings, there is but one uncreated and immeasurable being.
Similarly, the Father is almighty, the Son is almighty, the Holy Spirit is almighty. Yet there are not three almighty beings;
there is but one almighty being.
Thus the Father is God,
the Son is God,
the Holy Spirit is God.
Yet there are not three gods;
there is but one God.
Thus the Father is Lord,
the Son is Lord,
the Holy Spirit is Lord.
Yet there are not three lords;
there is but one Lord.
Just as Christian truth compels us
to confess each person individually
as both God and Lord, so catholic religion forbids us to say that there are three gods or lords.
The Father was neither made nor created nor begotten from anyone. The Son was neither made nor created; he was begotten from the Father alone. The Holy Spirit was neither made nor created nor begotten; he proceeds from the Father and the Son.
Accordingly there is one Father, not three fathers; there is one Son, not three sons;
there is one Holy Spirit, not three holy spirits.
Nothing in this trinity is before or after,
nothing is greater or smaller; in their entirety the three persons are coeternal and coequal with each other.
So in everything, as was said earlier,
we must worship their trinity in their unity and their unity in their trinity.
Anyone then who desires to be saved
should think thus about the trinity.
But it is necessary for eternal salvation
that one also believe in the incarnation
of our Lord Jesus Christ faithfully.
Now this is the true faith:
That we believe and confess
that our Lord Jesus Christ, God's Son,
is both God and human, equally.
He is God from the essence of the Father,
begotten before time; and he is human from the essence of his mother, born in time; completely God, completely human, with a rational soul and human flesh; equal to the Father as regards divinity, less than the Father as regards humanity.
Although he is God and human,
yet Christ is not two, but one.
He is one, however, not by his divinity being turned into flesh, but by God's taking humanity to himself.He is one,
certainly not by the blending of his essence, but by the unity of his person.
For just as one human is both rational soul and flesh, so too the one Christ is both God and human.
He suffered for our salvation; he descended to hell; he arose from the dead; he ascended to heaven; he is seated at the Father's right hand; from there he will come to judge the living and the dead. At his coming all people will arise bodily and give an accounting of their own deeds. Those who have done good will enter eternal life, and those who have done evil will enter eternal fire.
This is the catholic faith:
one cannot be saved without believing it firmly and faithfully
