We’re talking self hosting, not an enterprise setup. Industry best practices and layers of defense mitigation are not realistic expectations for something like a media server that is only intended to be accessed by the owner and maybe a couple other people.

Dynamic dns is what you need. Only takes a few minutes to set up

At some point in the future, yes I think so. Religion continues to exist because it fills many needs at the societal and individual level beyond just belief in the supernatural. People use religion for community, a sense of (greater or worldly) purpose, a moral compass, to accept mortality, deal with loss or big emotions, plain boredom, to control themselves or others, get power, make money, etc.

Assuming humanity doesn’t wipe itself out in the future, people will find other ways to fill the needs or answer the questions they currently use religion for. Religion will cease to exist but that doesn’t mean the things that replace it will be better.