Nancy2015

I got married in CA and got my marriage certificate the very next day. But we got married in the City Clerk's office, so maybe that is why it didn't take long.
We had a confidential marriage, USCIS didn't care. Confidential means that no one else will be able to get a copy of your marriage certificate, except for you two. Me and hubby thought it was a good idea, and did the confidential thing
Don't worry about USCIS

I don't see a problem with trying to get out of the abusive relationship. If the abuse is present, it doesn't make any sense to try to "save" the marriage - saving your own azz is the best thing to do in the OP's situation.
To the OP - I don't know if all this can have any impact on your citizenship application, it will be a good idea to talk to a good immigration attorney. But abusive USC's who threaten their spouses with deportation just because the marriage didn't work (moreover, the USC is at fault here!!) pi$$ me off. Totally.