What relevance does an event which took place 1700 years ago this week have for people today?

The event was the gathering of the Council of Nicea- a meeting of Christian bishops by the Roman Emperor Constantine the First. It met in what is now the Turkish city of Iznik from May until the end of July. It was an ecumenical meeting - the first of many to achieve agreement among all the branches of Christianity and it was as much political as it was religious

Its most significant achievement at the time was the agreement on the wording of a Creed - something which many Christians still say during their services today.

So why does any of this matter in 2025 and does the wording of that Creed still hold true in today's world?