It's made even more complicated in the Bible since it's not clearly delineated what blaspheming God really is. If i criticize his actions like in Job, is that now blasphemy? Per the NT, Jesus himself was considered a blasphemer, talking on behalf of God but he wasn't. In Amos, the guy literally goes against God's will and gets eaten by a fish, only to be useful later. What about Saul who killed Christian and then got God's blessing? And then if you sin and get saved, and you did blaspheme, what does that mean for you as a person? It's a very interesting topic, and the Bible is very confusing on where the line is drawn