Our knowledge of the LordJesusChrist comes from His Word and His HolySpirit.
Those who do not know the WordOfTheLord or have rejected the HolySpirit do not know the Creator, Jesus Christ. When a person does not know the Lord they will follow some other god which may in fact be their own self.
Such as do not know the Lord are living in the sin of unbelief which is the mother of all lesser sins.
Those who know the Lord Jesus by His Word and HolySpirit are awake to the fact that they are righteous because the HolySpirit is in them, and so they walk in it. Phi 3:9.
Summary: -> Our righteousness is by faith and gift. -> The unpardonable sin is unbelief.