If you say that he died for every human being in the same way, then you have to define the nature of the atonement very differently than you would if you believed that Christ only died for those who actually believe. In the first case you would believe that the death of Christ did not actually save anybody; it only made all men savable. It did not actually remove God's punitive wrath from anyone, but instead created a place where people could come and find mercy—IF they could accomplish their own new birth and bring themselves to faith without the irresistible grace of God.
This is the typical baloney fed to believers in Calvinistic churches.
What the Bible actually teaches is Christ provided reconciliation to all men, but only believers "receive" the reconciliation. Therefore Christ's death accomplished two things, (1) He became the propitiation or means of salvation for the whole world, all mankind, and (2) He became our justification, sanctification and redemption for those God puts in Christ, those whose faith God credits as righteousness.
So lets add up the false statements in the Calvinist mantra:
Christ's death did not save anybody. The truth is Christ's death saved everyone put in Christ. And it made all men savable. It is not either/or, it is both. Do you really think this is atad too difficult for the Calvinist wise men to grasp, or are they providing misinformation on purpose?
Christ's death did not remove the penalty of sin from anyone? The truth is when God puts a person spiritually in Christ, they undergo the circumcision of Christ where the body of flesh (sin) is removed.
Does Christ's death provide a place, a propitiation, where the lost can find mercy? Yes, but not by entering all by themselves. Scripture clearly teaches we do not enter Christ, God puts us in Christ, 1 Corinthians 1:30.
Do we bring ourselves to faith without God's grace? No, God sets before us life or death and begs us to choose life. But He alone sovereignly credits our faith, or not and puts us in Christ, or not, we do not save ourselves for it does not depend upon the man that wills but upon God.
Reformed Theology does not accurately reflect what the bible teaches, and worse, it misrepresents what other views teach.