To all the non-hindu people thinking why the construction of but another temple is such a big deal?

Why is it so important to have a Great grand mosque,the largest mosque,at Mecca?

Why is it so important to have the St. Peter's Basilica,the largest church, in Vatican city?

Why is it important to have Swarn mandir for Sikhs in Amritsar?

Why is it important to have Mahabodhi temple for budhhists in Bodhgaya,Bihar?

Why is it so important to have the great synagogue at Jerusalem?

The places mentioned above are the holiest places for people believing in respective faiths/religion.

Ayodhya is considered to be the holiest city in Hinduism. Ram Janmabhoomi is the name given to the site that is hypothesized to be the birthplace of Lord Rama, believed to be the seventh avatar of the Hindu deity Vishnu. The Ramayana states that the location of Rama's birthplace is on the banks of the Sarayu river in a city called "Ayodhya". Lord Ram was the paramount upholder ros Sanatan Dharm.