Are "الكفر" (disbelief) and "الإيمان" (faith) nominative or accusative in the sentence: "أَنَّ أَوَّلَ مَا فَرَضَ اللهُ عَلَى ابْنِ آدَمَ الكُفْرَ بِالطَّاغُوْتِ، وَالإِيْمَانَ بِاللهِ" (that the first thing Allah made obligatory upon the son of Adam is disbelief in Taghut and faith in Allah)?

"Kufr" (disbelief) and "Iman" (faith) are both in the nominative case in the mentioned sentence because "Kufr" is the predicate of "inna" (إنّ), and the predicate of "inna" is in the nominative case. And "Iman" is conjoined with "Kufr," and a conjoined word follows the word it is conjoined with in its grammatical case.