Is your belief that being God not eternal?
The Word that created all things or gave birth to the earth and the world is eternal being God, as the "Word was God." (Psa 90:2, John 1:1c)
That's why He emptied Himself the form of God and take the likeness of men to shed blood for our hope of salvation.
The word "emptied" with Strong#G2758, in Greek "κενόω kenoō" Thayer Lexiocn defined it as means - he laid aside equality with or the form of God, and etc.
While Mounce Lexicon defined it as - to divest one’s self of one’s prerogatives, etc.
That is, of His own free will He laid aside the bloodless form of God , and took the nature of a servant the likeness of flesh and blood as man, to accomplish the plan of salvation by shedding His blood.
Psa 90:2 Before the mountains were born Or You gave birth to the earth and the world, Even from everlasting to everlasting, You are God.
Php 2:7 but N1 R1emptiedG2758 HimselfG1438, takingG2983 the formG3444 of a R2bond-servantG1401, and R3beingG1096 madeG1096 in the likenessG3667 of menG444.
G2758
κενόω kenoō
Thayer Definition:
1) to empty, make empty
1a) of Christ, he laid aside equality with or the form of God
G2758
κενόω kenoō
5x: to empty, evacuate; ἑαυτόν, to divest one’s self of one’s prerogatives, abase one’s self, Php_2:7; to deprive a thing of its proper functions, Rom_4:14; 1Co_1:17; to show to be without foundation, falsify, 1Co_9:15; 2Co_9:3.
Already explained above.