Is there such a thing as a ‘deathbed confession of faith’ and, if so, is that enough to ‘save’ and/or ‘justify’ us?
NO. Remember -- James says "even the demons believe - and shudder" -- it is not faith ALONE that saves
Jesus himself says, faith, baptism, repentance, etc (see below) -- and if someone has led a horrible life (or even a normal, not good, not bad life) and on his/her death-bed just says "Lord, Lord, I believe", but does not repent, he will not be saved, that is what Jesus Himself told us. Take the good thief -- he REPENTED, he BELIEVED, he was baptised by the Blood of the lamb and he endured in this to his death and yes, he was saved
To reiterate -- from the moment of your acceptance, you must truly accept the Lord's freely given grace of salvation. The death-bed acceptance is the most extreme case, you have to admit, but even here, unless the person repents and believes, he is not baptised with the blood of the Lamb, he does not share in the body of Christ and no, he is not saved.
In a normal case, whether you are a Baptist or not, from the moment of your acceptance of Christ's saving grace, you must endure, you must repent, you must believe, you must share in the body of the Lamb and you must remember Matt 25:31-46
Isn't Jesus pretty clear? you MUST have faith to be saved by the freely given grace of salvation, however, it is not faith ALONE
Do you believe Jesus's words or not?
Justification detaches man from sin which contradicts the love of God, and purifies his heart of sin. Justification follows upon God's merciful initiative of offering forgiveness. It reconciles man with God. It frees from the enslavement to sin, and it heals.
Justification is at the same time the acceptance of God's righteousness through faith in Jesus Christ
Justification has been merited for us by the Passion of Christ who offered himself on the cross as a living victim, holy and pleasing to God, and whose blood has become the instrument of atonement for the sins of all men
On the death-bed the person who repents, believes has accepted God's freely given grace of justification -- note, we do not justify ourselves, nor do we earn this