You’d have to show me from the Bible that suicide is an unforgiveable act. The fact that the Catholic church teaches that suicide is unforgiveable does not make it so.
Suicide is murder.
Murder is a grave sin.
Sin can only be forgiven after repentance.
Repentance is impossible in a quick suicide.
If you jump off a tall building, you might repent on the way down; if you shoot yourself in the head, probably not.
***You’d have to show me from the Bible that suicide is an unforgiveable act.***
Eusebius tells of some Christians who broke from their Roman guards and threw themselves into the river to drown rather than go to what the Romans had in store for them.