Pascal's Wager was 'formulated' to get people into the church. It was a 'reason' to justify an introduction to the faith.
You hear the wager and choose to go to church based on 'logic.' The preacher (and God, through the preacher) is supposed to provide you with an impetus to stay. While you are in the church, you study, and you pray, and God is supposed to open your heart and speak to you.
Pascal's wager was not intended to prove or disprove the existence of God, but merely to point out:
The gain from believing in Christianity is greater than the gain from not believing in Christianity.
You must note however, that a Christian wrote this, and Christians have a habit of discounting life experiences that would be considered 'sins' in the face of 'everlasting life in heaven.'
Also, belief IS voluntary by controlling external events.
For example:
You know that there is no possibility of you coming to believe in a particular God if you never attend a church, read a holy book, or speak with someone of that particular faith. By controlling your interactions with these events, you can control your beliefs.
Likewise, your parents can exert partial control over your beliefs by controlling your circumstances.
Granted, you cannot force yourself to believe something, but you can restrict yourself from believing something.