While it may be true in Catholic theology, Catholicism has very little to do with scripture...The talk of sin nature is found in many places in scripture...But then you have to read the scripture to find it...
Gal 5:17 For the flesh lusteth against the Spirit, and the Spirit against the flesh: and these are contrary the one to the other: so that ye cannot do the things that ye would.
That's a sin nature...I can post a bunch of scripture to collaborate if you are interested but you guys don't seem to put much stock in God's scripture...
I see nothing there about a “sin nature.” Must be a man-made doctrine.
I see reference to “the flesh.” That’s human nature in the absence of grace. But it’s not a “nature” distinct from human nature.