Is Cain saved or he will go into the eternal perdition? This question is about speculations that might have taken place in Christianity on the matter of Cain's destiny - whether he will be in the kingdom of God (which means that he is saved) or he will go into eternal perdition.

Have there been any speculations on this matter in Roman Catholic, Orthodox or main-stream protestant Christianity (by main-stream protestant Christianity I mean those who believe that Jesus is both the Son of God and God - the same God as God the Father is - but don't consider themselves to be a part of Roman Catholic Church or Eastern Orthodoxy)? If yes, can you, please, share them here.

Cain was the first murderer in the human history.

The following verse speaks not in favor of Cain:


  From the blood of Abel unto the blood of Zacharias, which perished
  between the altar and the temple: verily I say unto you, It shall be
  required of this generation (Luke 11 :51)


However, I don't see any verse in the Bible pronouncing clearly that Cain will go into the eternal perdition. Or, perhaps, I am reading the New Testament in to the Old one here?
The same question can be asked of Judas, Goliath, or any other "villian" in the Bible. According to Scripture:

"The LORD does not look at the things man looks at. Man looks at the outward appearance, but the LORD looks at the heart."

The same could also be said of Saul of Tarsus, however, prior to his conversion.

Cain's curse, in particular, is known:


  Now you are under a curse and driven from the ground, which opened its mouth to receive your brother’s blood from your hand. When you work the ground, it will no longer yield its crops for you. You will be a restless wanderer on the earth.


Note how the entire curse is restricted to this life, and not the next. (Many would argue that the Old Testament does not have an afterlife, based on somethings that David, Job, and Qoheleth write - but that's a different question.) There is nothing that bears on the afterlife or eternal destiny, so no conclusion can be rightly drawn from Scripture to anything that extends beyond the earth.

Depending on one's soteriology, there are Christian positions that range from "God chooses whomever he wants" to "God will accept whoever turns to him."  The point in all of this is that:


a. We don't know, because we don't have enough evidence
b. We don't know, because God is ultimately in charge
c. We don't know, because we don't know how God chooses.


In short, we don't know.