He will not. A saved individual has accepted Christ and the Holy Spirit lives in him/her.
The question here is the definition of blasphemy, and the ultimate, or unforgivable blasphemy. Please see post 6.
I did see the post and agree with the first half but disagree on the last. Jesus tells us that blasphemy is attributing to the Holy Spirit anything that is Satanic (in this case, blaming Jesus’ casting out of demons by the Holy Spirit to be demonic).