Is rape the unforgivable sin ?

All sins, including rape, are forgiven by the person believing in the Lord Jesus Christ.  Jesus came to save sinners.  Death leads to immediate heaven or hell, and it is too late to be saved, after death.  To be in heaven and not hell, believe in the Lord Jesus Christ, who is God and who died on the cross and shed His blood to pay for all of our sins in full, and who was buried, and who resurrected from the dead.  The only way to avoid hell is by believing in the Lord Jesus Christ, without adding any of your own works.  See Romans 4:5, 1 Corinthians 15:3-4, and John 3:16.

No, but there's nothing worse than it save the unforgivable sin and for murder.

No.  It can be forgiven is the rapist properly repents before dying.

Blasphemy of the Holy Spirit is the unforgivable sin.

Any sin committed willfully is unforgivable. Jesus was referring to Numbers 15:30

The unforgivable sin is blaspheme against the holy spirit. The Scriptures make it clear that sin against the spirit involves acting knowingly and deliberately against the undeniable evidence of the holy spirit’s operation, as did the chief priests and certain Pharisees in the days of Jesus’ earthly ministry. However, anyone who may in ignorance blaspheme or speak abusively of God and Christ can be forgiven, provided that he is genuinely repentant. Nonetheless, since it is possible for a person to blaspheme against God’s spirit, this emphasizes the importance of keeping as far away from sinful speech as possible. (Jas. 3:2-10)

No it is not.

Blasphemy is defamatory, injurious, or abusive speech. Since the holy spirit has God as its Source, saying things against his spirit is the same as speaking against God. Unrepentantly resorting to speech of that kind is unforgivable.

No. I forgave. Then I had to forgive again. Forgiving isn't all for the offender, did you know that? It's for the person who is forgiving. That anger and resentment is not my friend, it can make it worse.

I don't think I can forgive a rapist. I never have, and I don't think I ever will.

"Sin" is not a thing for me, as an atheist. There are things that I do hold sacrosanct, like respecting other people, but that has nothing to do with religion, and everything to do with principles and common sense.

To damage someone else's life in that way... how could you live with yourself?

Geez I dunno, it can be a screwed up thing, this experience we know as life...

Nope, we can make repentance for ALL sin while alive through the mercy of Allah!