Hi Justified,
The answer to that is a short one.
Praise be to the God and Father of our Lord Jesus Christ, who has blessed us in the heavenly realms with every spiritual blessing in Christ. For he chose us in him before the creation of the world to be holy and blameless in his sight. In love he predestined us for adoption to sonship through Jesus Christ, in accordance with his pleasure and will— Ephesians 1:3-5
“Repent and be baptized every one of you in the name of Jesus Christ for the forgiveness of your sins, and you will receive the gift of the Holy Spirit. For the promise is for you and for your children and for all who are far off, everyone whom the Lord our God calls to himself.” Acts 2:38-39
and
"All that the Father gives me will come to me, and whoever comes to me I will never cast out. " - John 6:37
You have to remember God does not owe man anything, except justice, and that is basically damnation. All have sinned and fall short of His glory and deserving his wrath.
The fact that God chooses to save any of us is amazing grace indeed. So we have saving grace and we have justice in either instance.
That justice you speak of is not really justice. Justice requires that all be treated equally, all have to have the same chance to attain the same ends. Under calvinism that is not the reality. My disagreement is not with the bible it is with calvinism. The scripture that you quote are true but they do not support calvinism unless you forget what calvinism logically leads to.
Just to look at one point, the atonement, if as calvinist posit the atonement was only meant for those that were pre-selected then that logically means that those that were not in that chosen group had no chance of salvation. You may say that God was gracious in that He saved any, true He is, but that is not the point and you know it.
Why did Jesus come in the first place? To save sinners, to take away the sin of the world, to be the propitiation for the sins of the whole world. Those are all universal. Who can be saved, whoever believes how, by or through faith. The bible is clear that God loves the whole world His whole creation not just a select few. Calvinism would have us believe that God is glorified by sending the vast majority of humanity to hell when they had no chance to not be sent to hell.
Christ went to the cross to make salvation available to all not just a select few.