"In regards to the condition of men since the fall and original sin: What was the full affect of the fall, in regards to the relationship between men and God? Are men born into this condition of enmity with God?"
>>> In a collectivist tribal way with Adam as our federal head so that we inherit his legacy he has left us in this world, yes. But on the individual level of a person cannot come to God and follow him and be accepted and is born a child of Hell, no.
"Do you agree that the nature of me from birth is a sinful state?"
>>> Yes, but not in such a way that he is not able to overcome it and even reverse it through the habit of following the Lord and having God help him.
"Can a dead tree bare fruit? Can a bird with a broken wing fly?"
>>> Does this imply that God requires that of man which he is unable to perform and yet holds him accountable? Because if so, again, Romans 1 teaches against this. These texts also implies the same thing:
Deu_10:12 And now, Israel, what doth the LORD thy God require of thee, but to fear the LORD thy God, to walk in all his ways, and to love him, and to serve the LORD thy God with all thy heart and with all thy soul,
Mic_6:8 He hath shewed thee, O man, what is good; and what doth the LORD require of thee, but to do justly, and to love mercy, and to walk humbly with thy God?
But Romans 1 is so devastating because it is by Paul and also because it is so laid out and covers everything so you can't get out of it.
"After we discuss these points, maybe you can help me understand how a man can change his nature and bring himself to be spiritually alive."
>>> Sir, man still retains his good nature he was created with:
Deu_32:5 They have
corrupted themselves, their spot is not the spot of his children: they are a perverse and crooked generation.
Ecc_7:29 Lo, this
only have I found, that
God hath made man upright; but
they have sought out many inventions.
Rom 2:14 For when the Gentiles, which have not the law,
do by nature the things contained in the law, these, having not the law, are a law unto themselves:
Rom 2:15 Which shew
the work of the law written in their hearts, their conscience also bearing witness, and their thoughts the mean while accusing or else excusing one another
Man's nature has just been marred by the fall but not beyond recognition so that he is totally depraved and unable to obey God.
By turning to God and submitting to his commandments and trusting in his grace to take away our former disobedience we can live in his sight. And man doesn't do it by himself. It is synergistic, "workers together with God." (2Cor. 6:1, sunergeo)