ccgr hit the nail on the head on the first page.
The unforgivable sin, in reference to the Holy Spirit is not to believe HIS testimony to who Jesus is. The son of God. You don't accept Who jesus is, and what he can do for you, you can't be saved.
If there was another way to God, Jesus didn't have to die, he could have just told us of the way. But there isn't another way. That's what the Bible says, Gods word, and if God says one way, then it is. End point.
The great thing about forgiveness is it's free. Forgiveness is THE most powerful thing we have. There is no offence we can do to each other or ourselves that can't be forgiven. There is nothing that can be done TO us that we don't have the power of forgiveness over.
Keep asking the questions. Hear the truth.
Knowledge bring about what you believe, your beliefs define your actions. One day, with enough knowledge of the word, you can step out in faith, believe and see God work ( action, forgiveness).
He's awesome, we are all forgiven. every day.
sealcomm