Is there a sin that God will not forgive. I know that in the New Testament there is a verse where Jesus says sin against Holy Spirit will not be forgiven. But are there any other sins that God will not forgive?
Matthew 12:30-32 New International Version (NIV)
30 “Whoever is not with me is against me, and whoever does not gather with me scatters. 31 And so I tell you, every kind of sin and slander can be forgiven, but blasphemy against the Spirit will not be forgiven. 32 Anyone who speaks a word against the Son of Man will be forgiven, but anyone who speaks against the Holy Spirit will not be forgiven, either in this age or in the age to come.
Your answer is right there in the New Testament verse you are speaking of. I made it bold and italic so it stands out.