Gods knows a person heart, and by many accounts of the Bible God works in a persons heart to change there heart, instilling belief before they can choose accordingly the matters of God.
But God changes a person's heart by them "eating" the word. If the word is rejected, there is no change of heart. In order to "eat" the word, one must trust it to be true (ie believe).
I find your thinking to be rather circular but there you go. We can't all agree I guess.
You have a good day too mate.