What were the many military conquests of Umar's era? Were his wars defensive or offensive? How many countries were made Muslim by him by force of sword?
Islam did not come to force people to believe in it. Allah Says in Quran: The is compulsion in religion. (Sura 2, verse 256).
The Prophet Muhammad (SAWA) did not initiate wars on people to force the on Islam.
Wars during the government of Saqeefah rules were mostly politically motivated.
'Wassalam.