Well Jesus responded with His age. "Before Abraham was born I AM"That wasn't a question just some info.
Irenaeus is the one who said it was written at this later date. There wasn't anyone else that I know of that said that. All others were quoting him. He said in his youth he listened to Polycarp preach and heard Polycarp say that. Irenaeus also said that Jesus was almost 50 yrs. old when he died. Why? Because of the scripture where the Pharisees say to Jesus that He isn't yet 50, so how could He have seen Abraham.
It doesn't change the fact that this future beast and his armies are destroyed by Jesus and His armies which hasn't taken place. Rev 16:15 The focal point of the battle is the Holy Land. An image is set up in regard to this future beast that must be worshiped or you get murdered. Rev 13 The children in Rev are shown to be those who obey Gods commands and hold to the testimony of Jesus. The testimony while from the location of Jerusalem, Rev 11:8, is to the whole world.
Zech 14 testifies that in those days the Mount of Olives will be spilt in two making a way of escape from the surrounding armies. That hasn't taken place and end time prophesy is consistent that those armies of the beast are not defeated by human power. And the beast doesn't rise by human power either. But by deception. A powerful delusion allowed by God after His last warning and powerful signs are given. As we know a loving God warns and warns upfront. 1260 days of testimony and the sky can be shut up so no rain will fall. And the two witnesses who were killed because of the testimony of Jesus will be raised back to life in full view of the whole world and then a powerful earth quake. That earth quake could be when God splits the mount of olives in two.
I believe in future years a temple will be built by unbelievers.