The holy Roman empire had nothing to do with the destruction of
Jerusalem but it had a big part in the kingdom of God, every
thing did not end with the destruction of Jerusalem but had just
begun.
The HRE didn't include the Ancient Church of the East, the Assyrian Church, which in 900 formed fully 33% of all Christians and stretched from Mongolia to India to Ctesiphon.
the HRE didn't include the Orthodox who were in the Roman Empire or the Bulgarian Empire or under Islamic rule
The HRE didn't include the Copts or the Armenians or the Syriacs
the HRE didn't even include all Western Christians - even at its peak there were the Christians of Iberia, of Italia, of Poland, Hungary, England, Ireland, Scandanavia.
In what way could the HRE play any part in the kingdom of God in your opinion?