Ephesians 2,
And you were dead in the trespasses and sins 2 in which you once walked, following the course of this world, following the prince of the power of the air, the spirit that is now at work in the sons of disobedience— 3 among whom we all once lived in the passions of our flesh, carrying out the desires of the body and the mind, and were by nature children of wrath, like the rest of mankind.4 But God, being rich in mercy, because of the great love with which he loved us,
When we, the elect were born, we were born in original sin, which I know you agree with. We were not born holy and good. And because of our nature, we are born depraved. So by nature, we were under wrath. Name one person besides Christ who is not worthy of wrath.
Because of what Christ has done, God places us in Christ and we are covered with his blood. But this does not happen at the physical birth, or in eternity past, this happens at the appointed time. There is no way God will forget one of His. He says He is waiting patiently for the last elect to be born. If eternal redemption as you believe were true, why would he be patiently waiting to regenerate His last elect? Doesn't this prove there is an appointed time?
The Lord is not slow to fulfill his promise as some count slowness, but is patient toward you, not wishing that any should perish, but that all should reach repentance. 2 Peter 3:9.
This particular verse (2 Peter 3:9) weighs heavy with an appointed time.