It seems there is conflation between
actual sin and what some of us call
original sin.
First, actual sin does not reside in our bloodline. Rather, sin is a
positive act of the will which is contrary to the law of God. (cf. 1 John 3:4) Therefore infants, babies and those handicapped with mental deficiencies are not capable of committing actual sins. To believe that man sins just by the fact that he is man (i.e. has a human nature) renders God
the author of sin. With each subsequent conception, God would be bringing more sin (and therefore evil) into the world. Furthermore, man could not be held accountable for sinning, as he would simply be acting in accordance with his nature.
What David is speaking about in Psalm 51:5, which has been quoted,
is original sin. Original sin is actually a
deprivation.
The dogma of the Immaculate Conception has also been introduced. Ironically, the poster who introduced it also inadvertently provided the reason for it in
post #347...
"Could Christ, who is innocent, possibly be considered to be conceived in sin, I think not. Why the heck do you think Christ was born of a virgin by the Spirit .... to AVOID being conceived in sin, so He would be innocent."
The above is the best defense of the Immaculate Conception.