When a Muslim signs papers divorcing his wife in front of a non-Muslim judge

i married a muslem man feb 15, 1997. i was married under islamic law and the laws of the state of virginia. i am christain.
i told him i wanted a divorce and he said he did not want it but he would give it to me if i wanted it.
i went to a lawyer and filed for divorce. he signed the waiver and sent it back to me (he lives in new york) federal express , he said he wanted it done fast. the paper was witnessed by a notery public.
i held the papers for one week. i called him and asked him if he wanted me to hold the paper, he said it did not matter.
i sent the paper back to my lawyer and it was sent to court.
the divorce was finalized nov. 2, 1999.
now he says that we are not divorced.
am i divorced from this man by islamic law?
he belongs to the shafghy school. he is suni.