Under your analysis, someone who is a pedophile, a murderer or other type of sinner should also be permitted to become a minister because their sinful nature is somehow "willed by God." Of course it isn't. Such actions are the result of our rebellion against God, which started in the Garden.
Let's assume that we're all Calvinists, or we wouldn't be posting here.
Calvinism doesn't change the basic issue here, which is that some people's lives compromise their witness to the Gospel, and so they shouldn't be church officers. The fact that God created everyone doesn't mean that he created them all as good examples. That's why the Church is involved in discerning whether someone is called to ministry.
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