"IF"? Again you are at odds with 99% of those who call themselves Christian. God gifts Grace to everyone sufficient for their Salvation. Irresistible grace is a fabrication of a French lawyer, not the Holy Spirit. It is a perversion of the concept of efficacious grace. I would encourage you to expand your knowledge beyond the musings of Calvin. Read your whole bible. Then, if you are still interested in the concept of Irresistible Grace read Congregatio de Auxiliis.
Peace be with you.
The RCC over-estimates man and under-estimates God. It is a foolish, anti-scriptural logic.
If God wanted all men to be saved, all men would be saved. He's God. You're not.