if God demands that man is to repent and believe in the Gospel, and by "man" it means "the entire human race". Then it must mean that God has provided provision in the Death of Jesus Christ, for the sins of "the entire human race", which is the universal death of Jesus Christ (not universal salvation).
The Bible clearly states that His Name shall be called Jesus, because He shall save His people from their sins (Matthew 1:21 kjv). The entire human race may be His creation, but the entire human race is not His people.
In Egypt, everybody was His creation, but He sent Moses to demand that Pharaoh release a portion of that population in Egypt He called HIS people, and only them.
His blood protected only that portion of Egypt's population that were Hebrews, Jews, Israelite, whatever you want to call them.
The instruction to kill a passover lamb and to smear doorposts with its blood was given only to His people in Egypt, the Jews.
So the death AND resurrection of Jesus Christ is for a particular portion of the human race, those individuals the Father foreknew, and the Spirit sanctified. (1 Peter 1:2 kjv).
ALL sinners are deserving of eternal damnation, as there is NONE that is good. There is NONE who will, in and off themselves seek after God, for their salvation. It required that God the Holy Spirit, first CONVICT the sinner of their sin, their need to repent of their sins, and to believe in Jesus Christ as their personal Saviour and Lord.
This is why I posted that thread on Gospel salvation.
THAT salvation REQUIRES all things you said of those already regenerate.
That salvation is synergistic in that the blessings of eternal life may be experienced here in this plane we call time by those who are regenerate IF they do those things you stated and which are given as necessities by those who preach a universal atonement: repent. convert, obey, faith, faithfulness, etc.
The salvation which is of God, by God, and in God, wrought by Him in Christ had no pre-requisite or any kind of requisite other than mercy and grace (Titus 3:5), the humility and obedience of the Son (Philippians 2:8).
It is always sad when people whom Christ bled and died for, for whom He offered Himself to the Father, makes their eternal salvation all about themselves and grab glory from God.