I have never said not being baptized is a sin. Those are your words not mine. However, it is clear that not being baptized certainly can keep us from the kingdom of God as Jesus plainly taught in John 3.
Rebecca, if at least some of the cares of this life are not carried into the spirit world then why did Christ go preach to the spirits in prison?
For Peter says, “For Christ also hath once suffered for sins, the just for the unjust, that he might bring us to God, being put to death in the flesh, but quickened by the Spirit: By which also he went and preached unto the spirits in prison; Which sometime were disobedient, when once the longsuffering of God waited in the days of Noah, while the ark was a preparing, wherein few, that is, eight souls were saved by water.” (1 Peter 3:18-20). So he not only went to the spirit world, but he felt it necessary to preach to the individuals there. Would Christ preach to them if they could not improve their condition?
This then is the point, individuals in the spirit world can change. They can accept the gospel. They can receive the ordinances of salvation and still be saved in the kingdom of God.
Janderich, the souls of those who died before the death and resurrection of Jesus were in what we call limbus patrum, or the limbo of the fathers. The old Catholic encyclopedia has a good explanation of it.
Though it can hardly be claimed, on the evidence of extant literature, that a definite and consistent belief in the limbus patrum of Christian tradition was universal among the Jews, it cannot on the other hand be denied that, more especially in the extra-canonical writings of the second or first centuries B.C., some such belief finds repeated expression; and New Testament references to the subject remove all doubt as to the current Jewish belief in the time of Christ. Whatever name may be used in apocryphal Jewish literature to designate the abode of the departed just, the implication generally is
that their condition is one of happiness,
that it is temporary, and
that it is to be replaced by a condition of final and permanent bliss when the Messianic Kingdom is established.
In the New Testament, Christ refers by various names and figures to the place or state which Catholic tradition has agreed to call the limbus patrum. In Matthew 8:11, it is spoken of under the figure of a banquet “with Abraham, Isaac, and Jacob in the kingdom of Heaven” (cf. Luke 8:29; 14:15), and in Matthew 25:10 under the figure of a marriage feast to which the prudent virgins are admitted, while in the parable of Lazarus and Dives it is called “Abraham’s bosom” (Luke 16:22) and in Christ’s words to the penitent thief on Calvary the name paradise is used (Luke 23:43). St. Paul teaches (Ephesians 4:9) that before ascending into Heaven Christ “also descended first into the lower parts of the earth,” and St. Peter still more explicitly teaches that “being put to death indeed, in the flesh, but enlivened in the spirit,” Christ went and “preached to those souls that were in prison, which had been some time incredulous, when they waited for the patience of God in the days of Noah” (1 Peter 3:18-20).
It is principally on the strength of these Scriptural texts, harmonized with the general doctrine of the Fall and Redemption of mankind, that Catholic tradition has defended the existence of the limbus patrum as a temporary state or place of happiness distinct from Purgatory. As a result of the Fall, Heaven was closed against men. Actual possession of the beatific vision was postponed, even for those already purified from sin, until the Redemption should have been historically completed by Christ’s visible ascendancy into Heaven. Consequently, the just who had lived under the Old Dispensation, and who, either at death or after a course of purgatorial discipline, had attained the perfect holiness required for entrance into glory, were obliged to await the coming of the Incarnate Son of God and the full accomplishment of His visible earthly mission. Meanwhile they were “in prison,” as St. Peter says; but, as Christ’s own words to the penitent thief and in the parable of Lazarus clearly imply, their condition was one of happiness, notwithstanding the postponement of the higher bliss to which they looked forward. And this, substantially, is all that Catholic tradition teaches regarding the limbus patrum.