You ignoring,
A benefit of Christ dying for one is deliverance from the wrath to come. They weren't believers when Christ died for them, they were not even born. Yet when they were born sinners and ungodly, thy were already delivered from the wrath to come by not their believing, but the death/blood of Christ. Believing is another benefit of Christ dying for one. Its given with Christ to believe on Him Phil 1:29
29 For unto you it is given in the behalf of Christ, not only to believe on him, but also to suffer for his sake;
Believing on Christ is for His sake!, Christ died for all that become believers in Him- Christ died only for believers
Calvinism is a very heretical and dangerous theology that believers can be deceived into.
Calvinism denies man’s free will to obey or disobey God, which is the basis of man’s responsibility and accountability, as taught by the Bible.
6 And the Lord said to Cain, Why are you angry? And why do you look sad and depressed and dejected?
7 If you do well, will you not be accepted? And if you do not do well, sin crouches at your door; its desire is for you, but you must master it.
Genesis 4:6–7
26 Behold, I set before you this day a blessing and a curse—
27 The blessing if you obey the commandments of the Lord your God which I command you this day;
28 And the curse if you will not obey the commandments of the Lord your God, but turn aside from the way which I command you this day to go after other gods, which you have not known.
Deuteronomy 11:26–28
11 For this commandment which I command you this day is not too difficult for you, nor is it far off.
12 It is not [a secret laid up] in heaven, that you should say, Who shall go up for us to heaven and bring it to us, that we may hear and do it?
13 Neither is it beyond the sea, that you should say, Who shall go over the sea for us and bring it to us, that we may hear and do it?
14 But the word is very near you, in your mouth and in your mind and in your heart, so that you can do it.
15 See, I have set before you this day life and good, and death and evil.
Deuteronomy 30:11–15
19 I call heaven and earth to witness this day against you that I have set before you life and death, the blessings and the curses; therefore choose life, that you and your descendants may live.
Deuteronomy 30:19
15 And if it seems evil to you to serve the Lord, choose for yourselves this day whom you will serve, whether the gods which your fathers served on the other side of the River, or the gods of the Amorites, in whose land you dwell; but as for me and my house, we will serve the Lord.
Joshua 24:15
20 But Jeremiah said, They will not deliver you [to them]. Obey, I beg of you, the voice of the Lord, Who speaks to you through me. Then it will be well with you, and you will live.
Jeremiah 38:20
30 Therefore I will judge you, O house of Israel, every one according to his ways, says the Lord God. Repent and turn from all your transgressions, lest iniquity be your ruin and so shall they not be a stumbling block to you.
Ezekiel 18:30
30 Such [former] ages of ignorance God, it is true, ignored and allowed to pass unnoticed; but now
He charges all people everywhere to repent (to change their minds for the better and heartily to amend their ways, with abhorrence of their past sins),
31 Because He has fixed a day when He will judge the world righteously (justly) by a Man Whom He has destined and appointed for that task, and He has made this credible and given conviction and assurance and evidence to everyone by raising Him from the dead.
Acts 17:30-31