I clicked into this one because I had been pondering about what could be unforgiveable, had I already blasphemed against the HS when I was an atheist and so already been damned beyond redemption? If so I have no reason to have a conscience or moral values - and yet I do. I used to think I was a pretty good person and even though I didn't believe in God or any of the Scriptures I might be ok if it turned out I was wrong....
Wrong! 
So, I asked a couple of pastors and ministers from different churches and they had similar views to one another, that once the Holy Spirit is in you and you have truly accepted that Christs sacrifice and resurrection was for you it is almost impossible to blaspheme - but watch out if you do! "And Jesus said unto him, No man, having put his hand to the plough, and looking back, is fit for the kingdom of God." Luke 9:62
There is a difference between saying words against something in which you don't believe up until you DO believe it and in denying the existence of God after being saved (then maybe you were not really saved
). Another point of view is that those who accused Christ of being Satan when he performed miracles were blaspheming against the Holy Spirit and those in the present day who refuse to accept the truth of His existence are as bad as the Pharisees and Scribes who should have known better. So blaspheming is synonymous with rejection and we already know that we must wholeheartedly believe in Christ our Saviour to be saved.
I think it is all part of the call to us to remain steadfast in our faith and continue to call on His name even though we may be persecuted and even die because of our belief. Will you, under duress or torture, renounce your God or will you die having his name on your lips, knowing you will have eternal life.
Its a no brainer when I think of it that way.
Love
Carolyn
