I wouldn't say that. We might be walking in the flesh and disobedient, but not all children of the devil.
Gal 1:15 But when it pleased God, who separated me from my mother's womb and called me through His grace,
Paul was separated to the gospel before he was born.
Rom 1:1 Paul, a bondservant of Jesus Christ, called to be an apostle, separated to the gospel of God
Mat 13:37 He answered and said to them: "He who sows the good seed is the Son of Man. 38 The field is the world, the good seeds are the sons of the kingdom, but the tares are the sons of the wicked one. 39 The enemy who sowed them is the devil . . .
Notice you have good seed that is sown by the Son of Man.
Then you have tares that are sown by the devil.
Gen 3:15 And I will put enmity Between you and the woman, And between your seed and her Seed; He shall bruise your head, And you shall bruise His heel."
It seems that people are already born as good seed of the Son of Man or tares of the devil.
I know that in the Genesis context, "Her seed" is ultimately talking about Jesus, but how does the devil "have seed?" I can only assume by sowing tares.
Thank you for bringing this up. From what I know tares are weeds that are difficult to distinguish from wheat until they mature and produce fruit.
Like Paul says in Galatians 5:19-23 "Now the works of the flesh are evident: sexual immorality, impurity, sensuality, idolatry, sorcery, enmity, strife, jealousy, fits of anger, rivalries, dissensions, divisions, drunkenness, orgies, and things like these. I warn you, as I warned you before, that those who do such things will not inherit the kingdom of God. But the fruit of the Spirit is love, joy, peace, patience, kindness, goodness, faithfulness, gentleness, self-control; against such things there is no law.
By tares and wheat maturing and bearing fruit we have the end of the age or the fullness of the Gentiles being reached. The beautiful thing about the parable is that the wheat shall be turned into flour and flour is uniform everywhere. Flour is turned with water into bread which is the body of Christ, i.e. the elect after resurrection. What was broken during that Passover shall be remade whole.
Now there is also the parable of the true vine. From John 15:1-11, “I am the true vine, and my Father is the vinedresser. Every branch in me that does not bear fruit he takes away, and every branch that does bear fruit he prunes, that it may bear more fruit. Already you are clean because of the word that I have spoken to you. Abide in me, and I in you. As the branch cannot bear fruit by itself, unless it abides in the vine, neither can you, unless you abide in me. I am the vine; you are the branches. Whoever abides in me and I in him, he it is that bears much fruit, for apart from me you can do nothing. If anyone does not abide in me he is thrown away like a branch and withers; and the branches are gathered, thrown into the fire, and burned. If you abide in me, and my words abide in you, ask whatever you wish, and it will be done for you. By this my Father is glorified, that you bear much fruit and so prove to be my disciples. As the Father has loved me, so have I loved you. Abide in my love. If you keep my commandments, you will abide in my love, just as I have kept my Father's commandments and abide in his love. These things I have spoken to you, that my joy may be in you, and that your joy may be full."
Sorry for going at length but once grapes turn into wine, wine is again uniform and what was spilled during the Passover shall be offered again in the temple of God together with bread after the resurrection of the elect.
The tares are burned and gone. The bad grapes gone too. You see how just God is by not providing unecessary torment to the tares. Despite what Satan does, God in the love for his craft by contingency brings back together what Satan tried to undo. And Satan shall fail in his attempts for so God loved the world!
Blessings!