Answer:
The issue of doctrinal divisions and theological differences within Christian communities hindered Constantine's goal that making Christianity Rome's official religion would bring about Christian unity. Following the adoption of Christianity as the state religion of the Roman Empire, a number of Christian sects with distinctive doctrines and interpretations of the Bible emerged. On fundamental topics like the character of God, Jesus' ministry, and the nature of redemption, these groups regularly differed.
Constantine had believed that the unifying power of Christianity would assist to maintain the empire and foster social harmony. This anticipation was, however, dashed by the formation of several sects and theological disputes, which sparked violence within the Christian community.
In order to address this issue, Constantine called the Council of Nicaea, which sought to unify Christian doctrine and settle differences between various groups, in 325 CE. Doctrinal disagreements were a source of contention within Christianity for decades to come, even if the council did contribute to the establishment of a fundamental set of Christian beliefs and practices.