Scripture only lists one unforgivable sin: the blasphemy against the Holy Spirit or the sin that “leads to death” (1 John 5:16; Matthew 12:31-32). This sin is simply unbelief in the Gospel and has nothing to do with suicide. The false idea that suicide is an unforgivable sin stems from Catholicism which holds that a last confession is necessary in order to be forgiven (and someone who dies by suicide cannot have that last confession). But here, it is important to note that we believers are forgiven and cleansed once and for all time (Hebrews 10:14), not by any ongoing confession ritual.