You're seeing things that just aren't there as usual. Like all Calvinist you always twist it to make it match your imagination. Not one of these say we are born sinners.Psalms 51:5
Psalms 58:3
implied:
Genesis 6:5 ("all the time")
Genesis 8:21 ("from childhood")
Psa 51:5 Behold, I was shapen in iniquity; and in sin did my mother conceive me.
Psa 58:3 The wicked are estranged from the womb: they go astray as soon as they be born, speaking lies.
Gen 6:5 And GOD saw that the wickedness of man was great in the earth, and that every imagination of the thoughts of his heart was only evil continually.
Gen 8:21 And the LORD smelled a sweet savour; and the LORD said in his heart, I will not again curse the ground any more for man's sake; for the imagination of man's heart is evil from his youth; neither will I again smite any more every thing living, as I have done.
You really need to read scripture as it is and not as you want it to be.
MB