Massdak,
Jesus, the Lamb of God slain from the foundation of the world, was crucified to atone for the sins of the world. That means all the sins ever committed including Adam and Eve in the Garden, and henceforth and forever to come.
Nowhere in scripture does it say that the Christ's Atonement, the spilling of his holy blood, was for the sins of LESS THAN THE WHOLE of mankind.
Nothing in scripture says that atonement applies only from the death of Jesus foreward.
Therefore one must conclude that all mankind is covered by the blood of Jesus. Thus it is that Sins are not accounted to mankind in judgement. Jesus paid the penalty for sins...period! We also know from scriptures that there is nothing that mankind can do to earn salvation. The "works" of man are seen by God as "filthy rags", and no one saves "filthy rags", we all discard them. With Sins paid for, and Works not considered for Salvation, that leaves FAITH ALONE as the criteria for Salvation.
Atonement does not equate to Salvation! Jesus, the Son of God told us that Belief in Him, plus nothing, equates to Salvation.
Not even the eating of His flesh and the drinking of his blood can bring salvation. Nor does baptism bring salvation. for those are acts of obedience that one does after one believes in Jesus, not before.
Now it may be true that God established from the foundation of the world, some out of every generation who would be, by some mysterious compulsion, drawn to belief in God (Jesus) and thereby be saved. It may be these that are identified as "the elect". But the scriptures do not say that only the elect can believe, and they do not say that "only the elect" will receive salvation. But Jesus says, "Whosoever believeth in Jesus the Son of God Shall be saved."
The scriptures do not say that all mankind is Totally Depraved, but that All have sinned. Consider what God did at least twice before to those whose depravity became their god! In Noah's day, God caused the world to be flooded, thus drowning all but those alive in the ARK that God commanded Noah to build for his salvation. In Abraham's day, God destroyed the cities of Sodom and Gomorrah, saving only Lot, Abraham's cousin, and His two daughters because Abraham begged Him to, and Lot and daughters obeyed God.
If Mankind is Totally Depraved as Calvinism says they must be, then why has God withheld his wrath? Why has God extended His Grace and provided for the Salvation of ALL who believe in His Son? He did not do that for Noah's generation, nor for Sodom and Gomorrah. Though He would have if those people had repented from sinning!
God's Grace is for ALL mankind, indeed for ALL of Creation, and God's grace was established in the Garden with Adam and Eve.
Massdak, You can be confused by Calvinism if you want to be, or you can reject all the "isms" and Believe in Christ Jesus, and view scriptures from His perspective, He is, after all God the Son, the Savior of Mankind, and indeed, all of Creation.