The universe is infinite , nobody knows exactly about how many solar system is existing in this universe.We know so far only one and that is our solar system where earth is revolving and rotating .
We as human being , will realise that only the people of the earth ,devided in many color ,race, communinity ,religion and language .
We are living in the society where we are devided in region, countries as well.
There are the topic as headline that one nation one citizen but on ground it is not reality .
There is nothing like suggestion to make one nation one religion because the human is already having many races and community . Their living standard is differenciated from region to region and their faith is not constant on any believe .
Some human not believe in god but some have strong believe in god and even nature to be worshiped.
The demographic and geographic status of every region whether north pole or south pole of the earth is not same so it is imposible to make one law and implement of all the region .
Religion is the word which can be developed on the basis of faith on something and be devotee but it is imposible to make entire world to believe on one thing.
in summery, One nation One religion concept on entire world is not favourable to work with.
pics credit : google
Reference Article: https://blurtbharat.blogspot.com/2023/09/how-world-could-be-if-there-is-one.html