You are supposed to pray for the truth to be told and for God to be there with you. You should stay at peace and not stoop to his level. Is there any record of his porn and gay encounters in the divorce proceedings?
If your husband really thought God was on his side, he would not be using all these human tactics to frantically try to stop the divorce.
I will pray for the Holy Spirit to direct your words and actions and for you to be totally at peace with everything.
P.S. He's not violent, is he? If so, make sure you have people around you especially as the date gets closer.