Once Saved Always Saved? Part 1

I am chewing on a statement implied that one can “accept Christ” thus becoming a Christian and then live a life style separated from God in sin, and that sometime later in life can “come back” to Christ as a Christian. I disagree with that logic inherently as that would ultimately place Salvation on man’s terms or merit.
Faith is wholly leaning on Christ-for redemption, for righteousness, for counsel, for fellowship, for sustenance, for direction, for His Lordship, and for all in life that can truly satisfy. It is impossible to live a life in sin and have faith in God.
Dietrich Bonhoeffer wrote:
Cheap Grace means grace sold on the market like cheapjacks’ wares…Cheap grace is not the kind of forgiveness that frees us from the toils of sin. Cheap grace is the grace we bestow on ourselves. Cheap grace is the preaching of forgiveness without requiring repentance, baptism without church discipline, Communion without confession, absolution without personal confession. Cheap grace is grace without discipleship, grace without the cross, grace without Jesus Christ, and incarnate.
Paul Writes, “You were dead in your trespasses and sins, in which you formerly walked according to the course of this world, according to the prince of the power of the air, of the spirit that is now working in the sons of disobedience. Among them we too all formerly lived in the lusts of our flesh, indulging the desires of the flesh and of the mind, and were by nature children of wrath, even as the rest” (Eph.2:2-3)
Because we were born in sin we were born to death. People do not become spiritually dead because they sin; they are sinners by nature, and therefore born without spiritual life. Because we were born dead to God, we are dead to truth, righteousness, peace, happiness, and every other good thing, no more able to respond to God than a cadaver. “Trespasses and sins” and “transgressions” that Paul speaks of are not specific acts. They describe the sphere of existence of the person apart from God, the realm in which sinners live called Total Depravity.
Total depravity does not mean that every person’s life style is equally corrupt and wicked, or that sinners are always as bad as they can be. It simply means that man is corrupt in every regard. They are depraved in their minds, their hearts, their wills, their emotions, and their physical beings, and are utterly incapable of anything but sin. It doesn’t matter if they perform humanitarian, philanthropic, or religious deeds; they do them for their own glory not God’s. People are not “all God’s children,” Those who have not received salvation through Jesus Christ are God’s enemies (Rom. 5:10; James 4:4). At one time we were once like that, but by God’s grace we are no longer like that. Because of His saving work in us, we are presently and eternally redeemed. Therefore, one cannot “accept Christ” then return living a life style in sin and spiritually dead.