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Thank you so much for your question!

Was anything or anyone, before Christ, a firstborn creature?

Jesus Christ is "the firstborn of every creature."

Who is the image of the invisible God, the firstborn of every creature: - Col 1:15

In the beginning was the Word, and the Word was with God, and the Word was God. The same was in the beginning with God. All things were made by him; and without him was not any thing made that was made. - John 1:1-3

He is the beginning of "all that there is." His Name is Alpha and Omega.

Jesus is the only begotten Son of God the Father.

And the Word was made flesh, and dwelt among us, (and we beheld his glory, the glory as of the only begotten of the Father,) full of grace and truth. - John 1:14

God, who at sundry times and in divers manners spake in time past unto the fathers by the prophets, Hath in these last days spoken unto us by [his] Son, whom he hath appointed heir of all things, by whom also he made the worlds; Who being the brightness of [his] glory, and the express image of his person, and upholding all things by the word of his power, when he had by himself purged our sins, sat down on the right hand of the Majesty on high; Being made so much better than the angels, as he hath by inheritance obtained a more excellent name than they.

For unto which of the angels said he at any time, Thou art my Son, this day have I begotten thee? And again, I will be to him a Father, and he shall be to me a Son?

And again, when he bringeth in the firstbegotten into the world, he saith, And let all the angels of God worship him.

And of the angels he saith, Who maketh his angels spirits, and his ministers a flame of fire. But unto the Son [he saith], Thy throne, O God, [is] for ever and ever: a sceptre of righteousness [is] the sceptre of thy kingdom. – Hebrews 1:1-8

The Father was not begotten.

Likewise the Holy Spirit proceeds from the Father by the Son.

But the Comforter, [which is] the Holy Ghost, whom the Father will send in my name, he shall teach you all things, and bring all things to your remembrance, whatsoever I have said unto you. - John 14:26

The Father does not proceed from another.

God is One - and yet they are different Persons.

But of that day and hour knoweth no [man], no, not the angels of heaven, but my Father only. - Matt 24:36

For as the Father hath life in himself; so hath he given to the Son to have life in himself; - John 5:26

And I give unto them eternal life; and they shall never perish, neither shall any [man] pluck them out of my hand. My Father, which gave [them] me, is greater than all; and no [man] is able to pluck [them] out of my Father's hand. I and [my] Father are one. - John 10:28-30

Revelation 4 and 5 are particularly precious to me in revealing the Trinity - as is this single verse:

But ye are not in the flesh, but in the Spirit, if so be that the Spirit of God dwell in you. Now if any man have not the Spirit of Christ, he is none of his. - Romans 8:9

Praise God!!!