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As with all detective work, eliminating the usual suspects from the beginning goes a long way in quickly solving a case.
2 This was the first registration when Quirinius was governor of Syria.
Therefore the history of growth of civilization in the world is not 4 to 5 thousand years old but it is more than 10,000 years old.
So far history of the world, particularly of Indian subcontinent, is based on linguistic guesswork and religious beliefs/hearsay.
It was not until the third century that various pockets of Christians began to show interest in the date of Christ’s birth, and it would take another century for the Church to begin celebrating it with some uniformity.
In regard to the chronology of Christ’s life, Early Church leaders were primarily concerned with determining the date of his death in order to establish the celebration of his resurrection (Easter).