Everyone can become a Muslim or Christian after some easy formal procedure. On the other hand, it is quite hard to become a convert in Judaism; but if you were born a Jew it automatically means you are in Judaism, no matter how secular you are. It is called tribalism.
Tribalism is when certain tribes inherit assigned functions in society.
Some are priests, others are seafarers or royals and teachers.
What You are describing is a Babylonian Cosmopolitan ideal,
submission to global conformity to the exclusion of others,
from outside the 'G-dly economy'.
Universalism implies that, even religions,
are G-d's will, as well as nations and families,
when we understand the value of uniqueness,
then we can start describing what is universalism.
Religions seek to conform masses, Judaism isn't a religion, but a nation,
comprising of tribes, and of all the 'chosen among all the nations'...
A united nations in one nation, with the vision of world peace,
as the ultimate goal of human history, how does one get
more universal than that? Seek to circumcise all
human males and force them to speak, write
and pray in Hebrew?
Universalism starts with distiction.
Rather than the erasure of one's identity,
'meeting G-d' results in more contrasting individualism.