قَالَ ٱللَّهُ إِنِّى مُنَزِّلُهَا عَلَيْكُمْ ۖ فَمَن يَكْفُرْ بَعْدُ مِنكُمْ فَإِنِّىٓ أُعَذِّبُهُۥ عَذَابًا لَّآ أُعَذِّبُهُۥٓ أَحَدًا مِّنَ ٱلْعَٰلَمِينَ
This verse also makes it clear that the مائدة (the table spread with food) did not mean a meal that was actually to descend from heaven, for such miracles are never shown, it being impossible to disbelieve after one has witnessed the wonderful phenomenon of a table set out with food actually descending from on high.
The punishment referred to in the verse is the same as is mentioned in 19:91.
Christians did "disbelieve afterwards" and the threatened punishment has already made its appearance. The last and the present World War, along with their repercussions, constitute one phase of the fulfilment of this prophecy, and God knows what dreadful forms the fulfilment of this great prophecy is decreed to take in future and what dire visitations are yet in store for Christians in this world and in the next.
The punishment referred to in the verse is the same as mentioned in 19:91. The last two World Wars along with their repercussions may constitute one phase of the fulfilment of this prophecy and God alone knows what dire punishments are yet in store for the Christian nations of the West.