other people
I've heard that myself, but the problem arises of original sin. If God continues to create after the Sabbath, he seems to suggest that His works were not truly finished but needed to be added to (Eve's physical creation coming after but merely manifesting the fullness of God's works in creating man;for "male and female created He them." Much like the testament through Jesus Christ manifesting the ministry of the messiah prophesied within the law.)
For if that first covenant had been faultless, then should no place have been sought for the second. For finding fault with them, he saith, Behold, the days come, saith the Lord, when I will make a new covenant with the house of Israel and with the house of Judah: Not according to the covenant that I made with their fathers in the day when I took them by the hand to lead them out of the land of Egypt; because they continued not in my covenant, and I regarded them not, saith the Lord. For this is the covenant that I will make with the house of Israel after those days, saith the Lord; I will put my laws into their mind, and write them in their hearts: and I will be to them a God, and they shall be to me a people: And they shall not teach every man his neighbour, and every man his brother, saying, Know the Lord: for all shall know me, from the least to the greatest. For I will be merciful to their unrighteousness, and their sins and their iniquities will I remember no more. In that he saith, A new covenant, he hath made the first old. Now that which decayeth and waxeth old is ready to vanish away.
(Heb 8:7-13)
If there are other lineages created by God, then each of them would have to have sinned. The only other lineage of God is the first begotten Son of God, which is Jesus Christ (as opposed to Adam created by works) creating an opposition to sin, otherwise all born of God (through Adam) would be born of sin and subject to death.
...Likewise, after our example, should we not attempt to serve in the confidence of our works, which are of the letter of the law, but confident in the blessing and righteousness of God; believing in the increase which comes by His grace, even through the spirit of the law, in which we have resurrection from the "dead works" of sin. For the contrast is as the height of heaven, and as much as God is more than man. The peak of what we are and can do is, to say the least, fallen short of God's perfection. Our failure of the law proves our unworth to stand before God in our own merits, even as man could not create Himself nor come into being by His own power; so too our righteousness is not worthy to stand as though an equal with God. If it were otherwise, of what use is the gifts and labors of the LORD toward us, seeing we had no need of it (as if saying that we were all-sufficient and the LORD's works toward us were in vain: though even this is a contradiction, for God is Almighty, all-sufficient, and therefore needs nothing outside of Himself, yet has regard to our affairs, and works, and cares; for which it is written, "what is man, that you are mindful of him? and the son of man, that you visit him," and also, "humble yourselves therefore under the mighty hand of God, that he may exalt you in due time: casting all your care upon him; for he cares for you."). If then we be as God, we are perfect; our righteousness infinite, our reign everlasting, our every act is perfect and complete and timeless: all less than this is inefficient, useless, vain and defiled; sin. In regards to perfection, there is no measurement, there is no ratio nor percentage; either it is or it is not: and so it is with eternity, and so it is with God. If we, without repentance, approach unto God in such an insolent attitude as to suggest that we too are God and need nothing of that which God should grant, then surely we are to be judged as we have judged, and endure the same measure of burden and suffering we have placed upon God; and surely we, being God, should survive this test as splendidly as He, lest it is us that are proven imperfect, and thus temporal, and thus finite and limited, and thus vain! Wherefore it is written, "for to him that is joined to all the living there is hope: for a living dog is better than a dead lion."
So it is revealed through Martha and Mary, so as in the sons of Adam, Cain and Abel, and as in the sons of Abraham, Ishmael and Isaac; so in the sons of God, Adam and Christ! Trust not in the works, which are as of flesh, but in the blessing, which is of Spirit; first is the seed, sown by the works of man, and after the harvest, by the workings of God! For even as Adam, the son created by God, pales in comparison to Jesus, the Only Begotten (shown again in the sons of Abraham, the friend of God; the first, Ishmael, represents the attempt to fulfill the LORD's promises by works, and afterwards Isaac, representing the submission to God's blessing to the fulfilling of His Word through the Spirit by grace.), so too the written commandments of the law pales to the manifestation of God's grace through the Messiah thereof. So also the works of the sons of man are not perfect in their own right, but by the blessing of God, being judged by intent and spirit; hence the works of Cain, offering the fruits of his own labor, was refused, and Abel's sacrifice toward the grace and blessing of God, commemorating His works and increase was "imputed to him for righteousness;" and also Mary's regard to embrace and trust in the gift of God was more favored the Martha's efforts to honor the Lord through works.