You are correct! The belief system and ideas one develops are a mixture of things that have already been discovered before. It's like a big soup that you just keep adding on to as you pick what suits your needs and discard what doesn't. I mean that is exactly how systems are structured in our world right? We build on top of already established foundations.
If you're creative enough to think as well, you add in your own ingredients to the mix. Even if you build this miniature world of how you will live, what rules you will abide by, what your morals are, etc, you must never forget that it is all things you give meaning to function day to day in this world. Don't mistake the world you just built as the real one because it is a world built in your mind. All those ideas and rules exist in your mind alone. Because if you forget this simple fact, you just switched from one world to another, one religion to another, etc.
Reality is real. If you look outside your house, notice the stillness of everything that is inanimate. You have words for what you see because we, and you collectively decided that when you see a big box where people live in, it shall be called 'building' or whatever your word for it is in your language. The word isn't really real....Just like the ideas in your head. So a set of morals and beliefs are things manifested in your mind to make sense of what you experience and to create order for you.
All this may seem chaotic really, but notice the structure of language you use to describe things. Chaos is attached to a feeling of being unable to be in control. The natural response to this feeling is fear. I'd rather be in control thank you very much. But put the word aside and focus on the feeling because feeling, emotion is honestly one of the best forms of communication for understanding ourselves and our world. And feeling can be changed. If I so choose and vehemently believed that chaos is not something I associate with a loss of control, but one that gives me control, our feelings change.
Lol...I keep writing you essays but this is interesting stuff. Honestly bro, there is much to learn and understand about the world. I've just had a peculiar set of experiences coupled with a mind that refuses to shut up. The bottom line is that your faith keeps you safe. It is the land, where you are on familiar ground, with familiar people, and a familiar life. But there will always be those who are unhappy with this arrangement and look to the sea for adventure and most certainly a shorter lifespan but it's what they crave. You get to choose how you live, no one can decide that for you.