Have all of the Atheists and some others on like forums comited the unforgivable sin?

[RW_9]

Blasphemy against the holy spirit is the complete and utter rejection of God. It is the only unforgivable sin because it is by definition the refusal to ask God for forgiveness. No one is doomed to hell unless they have made the decision not to accept God's gift, and even then they can recant their decision. If you say you're sorry for your wrongs (repent) and ask God for forgiveness, he will forgive you. Believe Jesus died for those sins, and that's all there is to it. If a Christian truly worries about not going to heaven they probably have nothing to worry about.

This is the most common response I see from Christians, except it didn't include the tidbit about suicide being a form of rejection and also being unforgivable. Though the latter has become a more contended point between Christians in modern times.