Hmm I wouldnt say we are all born dead but we are all born in the flesh which will eventually decay and die, unless we have the spirit.
Your flesh will will die and decay even if you do "have the spirit".
1 Cor 15:35; But someone will say, “How are the dead raised? And with what kind of body do they come?”
1 Cor 15:36; You fool! That which you sow does not come to life unless it dies;
1 Cor 15:37; and that which you sow, you do not sow the body which is to be, but a bare grain, perhaps of wheat or of something else.
1 Cor 15:38; But God gives it a body just as He wished, and to each of the seeds a body of its own.
1 Cor 15:39; All flesh is not the same flesh, but there is one flesh of men, and another flesh of beasts, and another flesh of birds, and another of fish.
1 Cor 15:40; There are also heavenly bodies and earthly bodies, but the glory of the heavenly is one, and the glory of the earthly is another.
1 Cor 15:41; There is one glory of the sun, and another glory of the moon, and another glory of the stars; for star differs from star in glory.
1 Cor 15:42; So also is the resurrection of the dead.
It is sown a perishable body,
it is raised an imperishable body;
1 Cor 15:43; it is sown in dishonor, it is raised in glory; it is sown in weakness, it is raised in power;
1 Cor 15:44;
it is sown a natural body,
it is raised a spiritual body.
If there is a natural body,
there is also a spiritual body.
1 Cor 15:45; So also it is written, “The first man, Adam, became a living soul.” The last Adam became a life-giving spirit.
1 Cor 15:46; However,
the spiritual is not first, but the natural;
then the spiritual.
Your fleshly body you have now isn't the one you get after you are resurrected.