I see what you’re getting at, but Jesus identified Himself as God’s only begotten Son prior to His resurrection.
True, but definitely not in the way that you or others here are describing. In fact, the only time that Jesus referred to himself as "the only begotten Son of God" was when he was foretelling of his resurrection from the dead and how our salvation is directly linked to our belief in the same.
John chapter 3
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16] For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.
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17] For God sent not his Son into the world to condemn the world; but that the world through him might be saved.
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18] He that believeth on him is not condemned: but he that believeth not is condemned already, because he hath not believed in the name of the only begotten Son of God.
Nobody, and I mean NOBODY, can be saved without a belief in Christ's resurrection from the dead.
Romans chapter 10
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6] But the righteousness which is of faith speaketh on this wise, Say not in thine heart, Who shall ascend into heaven? (that is, to bring Christ down from above)
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7] Or, Who shall descend into the deep? (that is, to bring up Christ again from the dead.)
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8] But what saith it? The word is nigh thee, even in thy mouth, and in thy heart: that is, the word of faith, which we preach;
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9] That if thou shalt confess with thy mouth the Lord Jesus,
and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved.
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10] For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation.
In fact, if Christ isn't risen from the dead, then our faith is vain, and we are yet in our sins.
"And if Christ be not raised, your faith is vain; ye are yet in your sins." (I Corinthians 15:17)
In order to be saved, we not only need to believe in the "only begotten Son" or in the risen Lord and Savior, but also "in the name of the only begotten Son of God". Jesus wasn't given a name above all names until AFTER he was "begotten" or until AFTER he was raised from the dead and had ascended back to the Father in heaven, and it is this exalted name that we truly need to believe in.
If you think that anybody is saved by believing that Jesus was "begotten" in the sense that you and others here are describing or by believing simply in his virgin birth, then you're greatly deceived. Without Christ's resurrection from the dead, ascension back to the Father in heaven, and sub sequential glorification, there is no salvation at all available to anybody on the planet. That's reality. Jesus was "appointed heir of all things" (Heb. 1:2) AFTER all of these things transpired, and nobody can be made a "joint-heir with Christ" (Rom. 8:17) apart from faith in these very things.
Let me ask a question from a different angle. Do you believe Jesus is the Son of God prior to His resurrection?
Was Jesus "the Son of God" prior to his resurrection? Yes, he was, BUT he was NOT "the only begotten Son of God" prior to his resurrection because Jesus was "begotten" on the day in which he was raised from the dead.
Furthermore, Jesus wasn't declared to be the Son of God with power until AFTER his resurrection from the dead.
Romans chapter 1
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1] Paul, a servant of Jesus Christ, called to be an apostle, separated unto the gospel of God,
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2] (Which he had promised afore by his prophets in the holy scriptures,)
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3] Concerning his Son Jesus Christ our Lord, which was made of the seed of David according to the flesh;
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4]
And declared to be the Son of God with power, according to the spirit of holiness,
by the resurrection from the dead:
Anyhow, eventually, I'll start a blog on when Jesus was truly "begotten". When I do, I will address every single time in scripture that the word "begotten" is used in relation to Jesus Christ. At that time, it will become clearly evident, to anybody who doesn't stubbornly shut their eyes to the truth, that is, that every single time that the word "begotten" is used in relation to Jesus Christ it is used in relation to his resurrection from the dead.