[kosta50]

PS 51:5 simply reiterates that our fallen nature has a propensity to sin from the moment of our conception.

"The fathers shall not be put to death for the children, neither shall the children be put to death for the fathers: every man shall be put to death for his own sin." [Deut 24:16]

"The soul that sinneth, it shall die. The son shall not bear the iniquity of the father, neither shall the father bear the iniquity of the son...[Ez 18:20]

[Forest Keeper]

PS 51:5 simply reiterates that our fallen nature has a propensity to sin from the moment of our conception.

That is not at all what the verse says. Psalms says "SURELY I was sinful at birth, ..." (emphasis added). Propensity addresses a likelihood, not a guarantee. This is a guarantee. Now I suppose that "surely" no longer means "surely". At least you all are consistent. :)

Neither of your verses addresses this issue. They say that I will not be punished for the sins of my particular biological father, they do not address the original sin of Adam.