Totton, my own understanding is this…
In Acts 7, unbelieving Israel as a nation has all but reached the height of its rebellion against God in the Law and the Prophets’ assertion (as further witnessed first by the Lord and the Twelve in Matthew thru John, and again by the Spirit n Acts 1 thru 7 via the Twelve and those of the circumcision which believe with them) that Jesus was/is the LORD’s Prophesied Christ, Acts 7:51-53.
With that, Israel was then headed towards events which would culminate in the height of their rebellion; the height of their departure from Moses as to Who Christ was/is, John 5:43, John 5:46; Acts 7: 51-53.
The height of said departure from Moses would have culminated in their being taken in by the man of sin; c. f. Daniel. 11:32.
Israel was headed towards that. “But where sin abound, grace did much more abound,” Romans 5:20.
This is where the world was at until Romans 3:21, when God interrupted all that; saved Israel’s chief sinner in all this; Saul of Tarsus, 1 Tim. 1:15-16, and sent him out with His Mystery message of “grace and peace to you” to all without distinction, Romans thru Philemon.
When this offer of “grace and peace to you” is over with; Romans 11:25, then, at some point after that; Israel in unbelief, together with the rest of the world, will be right back where things were headed in in Romans 1:18 – Romans 3:19, the “cause” for “strong delusion” that Paul relates in 2 Thessalonians 2:10-12, will come upon the world, but for those “who know their God,” Daniel 11:32; Rev. 3:10-11.
I do not believe that the man of sin is Jewish or is connected to Israel, he is WORLD ruler. He opposes ALL religion and everything called god.