For understanding people's responses to this, I think it's best to think of it as a war. The human race is under attack, millions of us have died, and we are hurting emotionally. During this time, we've had politicians actively say we should just give up and let the enemy kill 10x as many people, and enough people have followed these politicians' views to effect the deaths of at least hundreds of thousands in the US.

This may not be your view, but it is the view of many, that we are under attack, and people's lives are at stake. A ton of people have lost loved ones. Or they've had loved ones at deaths door and on oxygen and suffering for weeks.

So while you view those vaccinated folks who don't want to be around unvaccinated people as having a "religion," it may be just that they view you as a traitor to humanity. Back during the Iraq war, I didn't support us starting it, and for that position many people treated me far far worse than simply not wanting to be at a company picnic with them. The people who treated me poorly for my views often had family who were in the military, and didn't want to think that they were putting their lives at risk for nothing. It wasn't even that the US itself was at risk, it's that they wanted their family to be risking their lives for a cause everyone supported. So when people have been fighting against a local enemy that is hurting us all, I'm surprised the reaction is so mild as to not want to be at the same picnic.