The New Creation Is Dependent on Us

We're being part of God's new creation plan in the way we do our work. But to what extent is it dependent on us and who will ultimately bring everything together? I've even heard some people sort of take your theology and say well actually whatever the new creation is will be the ones creating it. And it doesn't involve any supernatural intervention in the sense it's all from our own efforts. This is an 18th century fancy that you've got natural and supernatural and never the train shall meet.