He makes a great point about taking the Lords name in vain. Id only say that his correct claim is another way His name can be used in vain in addition to saying G-Damn or OMG (where the G in that acronym is God)
Its true that God isnt His name but its said (and written with a capital G) in place of His name (since no one can pronounce His name perfectly) , so to use it haphazardly is to use it in vain.
And hes somewhat right about the unforgivable sin. The only unforgivable sin is blasphemy against the Holy Spirit and what that can only mean is when one does not seek forgiveness for ones sin. Because the Holy Spirit was and is sent for the forgiveness of sin, as well as our comforter. Sin is washed away through the power of the Spirit. So to not seek forgiveness, to remain in sin either due to obstinacy or despair, is to blaspheme Him. Ignorance not so much, but willfulness yes.
I'm unhappy that Mike presumes to know the eternal destination of anyone. No one on earth knows for sure unless they're present at the moment of death and the person dies while publicly asserting his antipathy to God's salvation. One of the thieves who died next to Jesus is an obvious example--deathbed conversions are real and commonplace.
I like your last paragraph. It illuminates a subject I was slightly unclear about.