I respect that. This is one of the reasons I ended up leaving Calvinism. I believe God COULD just flip a switch in someone's heart and make them willing to do whatever He wants, but I just don't think God works that way.
Jonah, for example, didn't want to preach to Ninevah, and God could have simply "quicken" or "awakened" or "enlightened" him by some effectual inward working to make him want to go, but He didn't. He use normative/outward means (storm/big fish). I think the same is true with how it works with us. He could do as Calvinists suppose by simply flipping a switch (i.e. regeneration) and make people willing to do what they didn't previously want to do, but how is that different from making the rocks cry out? I believe God uses means such as the preaching of gospel, teaching, debate, envy, circumstances, prayers, the church, nature, signs, etc etc, to persuade men to change their minds. These means are resistible, but nonetheless they are "of God." As such, God gets the credit for bringing what was needed for salvation, and man gets the blame for his resistance of the clearly revealed and understood truth...thus making them truly "without excuse."