You are correct in that everyone has a metaphysical worldview. Even an atheist who holds solely to reductive materialism has a metaphysical worldview. Theologists often extrapolate that to a definition of religion such as Merriam-Webster's usage number four which allows a definition of religion to be defined as "a cause, principle, or system of beliefs held to with ardor and faith."
The agenda of the postmodernists isn't simple acceptance of persons who are different or believe or behave differently in line with classical tolerance but rather they require approval and participation in their attitudes and activities and seek to use government force to accomplish it.
"They think it strange that you do not plunge with them into the same flood of dissipation, and they heap abuse on you." 1 Peter 4:4.
The "religion" of postmodern political correctness is defined as conforming to a belief that language and practices which could offend postmodern political sensibilities [as in matters of sex or race] should be eliminated.
Eliminated. Pay attention to that word as that is their ultimate goal.
They seek to eliminate your religion and replace it with their own "religion."
Since your religion and epistemology is irreparably in opposition to their "religion," how will they be "eliminate" yours?
Initially, it will be through the rule of law and bullying (e.g. persecution). When that fails to force you to abandon your religion for their "religion," their only remaining option is to eliminate you.
Behold, the "new tolerance."
Hmm... I believe everyone is religious. Some about sports, some about their faith in God or gods and godessess, others concerning finances, possessions and sex. Humans can make a religion of anything. So I'm not buying that one.