HP: That depends on what you are referring to. Man is not born with a sinful moral nature, for neither sin or morality cannot be predicated of any necessitated state devoid of choice. Neither sin or righteousness are created states nor can they be. Morality at its heart centers on the ability to do something other than what one does under the very same set of circumstances apart from consideration of punishments or rewards. Without the initiation of an act of the will in the formation of an intent of either benevolence or selfishness, no morality can be predicated of the soul or the ‘nature’ we are born into by necessity. Morality rules in the realm of choice alone as opposed to the realm of necessity.
In another sense, if we are speaking of a natural proclivity to sin, a natural inclination to sin that is the results of physical depravity as a result of the fall and sin, and limit the word ‘nature’ to the realm of the sensibilities, yes, in a sense man is born with a nature to sin. Because the natural proclivities have clearly been corrupted by the fall, and serve as formidable influences to selfishness, the root of all sin, in a sense it could be said we are born with a sinful nature. Again, I am limiting the word ‘nature’ to our corrupted sensibilities and not the will itself.
Because of what I see as utter confusion in much of the Church as to our constitutional makeup from birth, and the all but total inability to distinguish between the sensibilities, those impulses and influences via the flesh itself that are not sin (for they are necessitated traits) and the will itself (the chooser), I would as a general rule refrain from saying we have a sinful nature.
I believe it far more an accurate depiction of the state we are born into to refer to our state as being born with a natural proclivity to sin or an natural inclination to sin, but clarify that neither of these in and of themselves are sin. Only as we yield our wills to these selfish impulses is sin conceived.
As a statement of faith I might say the following: All are born with a natural proclivity to sin as a direct result of the fall that corrupts the sensibilities of man, and all that come to the age of accountability sin and become guilty before God.
Note: the ‘sin itself’ comes subsequent to, as a result of, the will choosing and not before.
Of a truth, all men in our dispensation have indeed yielded their wills voluntarily to the proclivity to sin we all are born with, and as such have sinned and became guilty before God.
Does this help answer your question in a manner you can follow? Am I confusing as you see it in my explanation?