In 313 ad, the Edict of Milan made Christianity tolerated within the Roman Empire, and over the next decades later, the Roman Empire adopted Christianity.
How did Christian Romans view themselves and their country, given that it was the Romans who crucified Jesus? Did anybody during that time think it was odd or amiss that they were practicing the religion which the man whom they crucified three centuries ago started?
How did they view themselves, given that they were the reason for Jesus’s crucifixition? Did they write it off as “simply another time”? Did they call their previous leaders corrupt?
We have some answers to some similar questions:
What did 1st and 2nd Christians think about the Roman Empire? by u/MagratMakeTheTea
Why is Ancient Rome still so highly regarded among Christians despite being responsible for the death of Jesus? by u/Upper-Lawfulness1899 and u/Apprehensive-Link838
Hopefully those help...I think maybe the briefest explanation is that they pretty quickly decided the Jews were actually to blame, not the Romans.