All have sinned (Rom 2;23) so all need forgiveness. This is why salvation needs to be of grace, it cannot be of works. GRACE is a merited favour according to 1Peter 5;5, which tells us that God gives grace, and that pride makes people ineligible, humility makes people eligible. Salvation is by grace so God gives salvation to the humble.
What happens when a person finds grace in God's eyes as Noah did in Gen 6;8? They are predestined to believe in the Gospel. Three possible situations follow predestination unto salvation.
1.) If the person has heard the gospel they will repent and receive the Holy Spirit immediately, their belief is supernaturally changed to one where they believe the warnings in the Bible about hell for disobedience, they believe God's grace is conditional.
2.) If the person has not heard the gospel they are drawn to the gospel and they believe.
3.) If the person lives in a nation that does not have the gospel they will believe the gospel if it arrives, otherwise they will go to heaven when they die. This is supported by the Bible, tribal religions and testimonies. Tribal people report seeing people's souls go either up or down after death and their religions include a good afterlife for good people and a place of torment in the middle of the earth for bad people.
Salvation-faith is from God (Matt 16;17, 2Tim 2;25, John 6;65, Eph 2;8-9, Rom 12;3, etc.) God blocks others from being saved (Rom 11;8, 2Cor 4;3-4, 2Thes 2;11-12).
All have sinned so all have something to be humble about. Those who have no shame in evil show themselves to be evil and despite the fact that God desires to save them (1Tim 2;4) he cannot save them.
It is by God's grace that a person becomes a believer and by God's grace that a person stays a believer. Believers obey to keep God's grace and to thus keep their inheritance.
This doctrine is called Humility Enabled Grace. Search for it on YouTube or Scribed if you are interested. God bless you all :-D