This assumes such a god wants to gather believers by using omnipotent force. Traditional Judeo-Christian interpretation of God states only that God hopes that his 'children' (humans, perhaps other creatures I suppose) will walk with him in the light, so to speak. However, God's gift of free will supercedes any personal desire of His own to have believers, as it is generally understood that 'free-will' is what seperates us from animals (again, under traditional interpretation). I believe you are confusing the church's desire for offering-plate participants with God's desire for believers.