Good question, I like thinking about this one because it makes me think more about salvation in accordance to human evil. First, I'll look to our own Christian scriptures. To start, I will say that it is written plenty that Jesus died for the sins of all men, from the greatest to the worst, across the board. All sins are forgiven through Him. With that said, one of my favorite verses for this subject can be found in the Epistle to the Hebrews (12:14, I use the English Standard Version), where it is written:
>Strive for peace with everyone, and for the holiness without which no one will see the Lord.
The idea we should focus on here is in the latter half of this sentence, stating that, without "holiness" we aren't going to see God (i.e be in His presence). Repentance and salvation is much more than just keeping your sinful attitude and your unholiness forever when you're up there with The Lord. We can not just look at it as "God forgives us, hooray". Salvation regenerates and cleanses the spirit. It burns out your sin and washes the ashes of evil out from your soul. If the most wretched, despicable, dastardly man to have ever lived were to have accepted Christ's gift of salvation and died, his spirit will not be as he once was on this Earth. He will be like Christ, and will see, through the same view, the absolute evil of his sin. He will be an absolutely new person, holy and perfect in the mind, as God originally intended before sin took us over. Now, only God knows who is and isn't going to heaven, and so we have to look at heaven through this view, rather than simply a place of forgiveness, for it is also a place of utter cleansing; God's eternal paradise for our souls will include Christ-accepting victims of rape, and it will include redeemed rapists, it will include believers who were murdered and it will include redeemed murderers, it will include the most devout and the most dastardly, all redeemed, all sanctified, and all born anew. So, in my own view, yes, if this man was genuine in his repentance and belief in Christ's sacrifice as what would bring him to be with God for all of eternity, yes, he accepted God's gift and God's will, and this cleansing is fair by God's will.