Well 1John 5:17 proves this wrong right off the bat!
1John 5:17 All wrongdoing is sin, but there is sin which is not mortal.
Then we have what Jesus taught us.
Matthew 12:32 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.
So the levels accoring to the bible are:
2) Deadly (Mortal)
3) Not Deadly.