I wish to know how those who follow a faith rooted in traditional Calvinist theology have such confidence in their belief that they are of the elect predestined to salvation?
In the Synod of Dort it details a doctrinal point known as Perseverance of the saints which states that "since God is sovereign and his will cannot be frustrated by humans or anything else, those whom God has called into communion with himself will continue in faith until the end."
Given that election is based on the fact that one must persevere in their faith to the end, how would one even know they are truly one of the elect until the moment of their death? Since we know nothing with any certainty of our future, their would be no way of knowing with any absolute certainty that we will not have a crisis of faith in those moments before our death. Therefore one can not place any confidence in their salvation based on their present state of faith.
Romans 8:31-39
What, then, shall we say in response to these things? If God is for us, who can be against us?
32 He who did not spare his own Son, but gave him up for us all—how will he not also, along with him, graciously give us all things?
33 Who will bring any charge against those whom God has chosen? It is God who justifies.
34 Who then is the one who condemns? No one. Christ Jesus who died—more than that, who was raised to life—is at the right hand of God and is also interceding for us.
35 Who shall separate us from the love of Christ? Shall trouble or hardship or persecution or famine or nakedness or danger or sword?
36 As it is written:
“For your sake we face death all day long;
we are considered as sheep to be slaughtered.”
37 No, in all these things we are more than conquerors through him who loved us.
38 For I am convinced that neither death nor life, neither angels nor demons, neither the present nor the future, nor any powers,
39 neither height nor depth, nor anything else in all creation, will be able to separate us from the love of God that is in Christ Jesus our Lord.