What was the significance of the Edict of Milan announcing tolerance of Christianity and then the adoption of Christianity as Rome and official religion?

The Edict of Milan, issued in 313 CE by Emperor Constantine and Licinius, marked a pivotal moment in Roman history by granting religious tolerance to Christianity, effectively legalizing the faith and allowing Christians to worship freely. This shift helped to end centuries of persecution and laid the groundwork for Christianity to flourish. The subsequent adoption of Christianity as the official religion of the Roman Empire in the late 4th century under Emperor Theodosius I further solidified its influence, transforming the cultural and political landscape of the empire and establishing Christianity as a central force in European civilization.