According to Jinyoung Park, in order to be saved and go to heaven

‌It is not enough to simply believe on your own.
While the process begins with you deciding to believe in God (Jesus),
the subsequent realization of a true, certain faith without doubt is a gift given by God.
In other words, that is within God's jurisdiction and is His choice.
Therefore, no one knows when that will happen, and it could take years or even decades (it took me 7 years).
To receive such complete faith, one must constantly repent, pray, and live within the fellowship of saints in the church, seeking and performing God's will and work.
However, since God has promised to grant salvation to those who wait in repentance, one can certainly receive salvation if they endure and wait.
This is the argument, and while I think the biblical interpretation and doctrine itself make sense,
it seems like salvation becomes an incredibly painful and difficult matter from a believer's perspective.
He promised salvation, but ultimately it is in God's hands,
and since we don't know when He will grant that perfect gift of faith....
If one lives according to God's will, repents, and trusts His promise, but then dies without being saved,
they wouldn't be able to enter heaven.
I wonder if anyone can truly believe in God and live a church life when it feels this terrifying or futile ㅡㅡ