@MK878 I'm not your immigration or family lawyer. However, it's in your interest to finalize divorce ASAP. Give him whatever he needs and close this chapter. Unless you're splitting millions of dollars or fighting for the kid (which I realize may be the case), it's easier to move on. This will give you final divorce decree which will allow you to get I-751 approved and stay in this country.
If your I-751 gets denied, you can refile quickly a new I-751 with all good evidence with divorce waiver.
But if you delay it, you may be put in removal. Which is a lengthy process, but may get you deported eventually if you don't get it right.