It’s not an assumption, that is what we have observed to be true.
I don’t think you understand how science works.
This has liltte to do with understanding how science works – and while I can’t speak for Peter Plato: since I am a scientist myself, who probably knows a whole lot more about science than you do, you might think twice before lecturing me about science *).
And Peter is right, it is an assumption and an unsupported claim. It is not what we have observed to be true. You cannot prove with science (the natural sciences), which only studies the physical world, that there is nothing outside the physical world, and that the physical world is all there is to truth – no matter how excellent science is in exploring and explaining the physical world.
In a
1998 statement titled
Teaching about Evolution and Science, the American National Academy of Sciences said:
“At the root of the apparent conflict between some religions and evolution is a misunderstanding of the critical difference between religious and scientific ways of knowing. Religions and science answer different questions about the world …] Science is a way of knowing about the natural world. It is limited to explaining the natural world through natural causes. Science can say nothing about the supernatural. Whether God exists or not is a question about which science is neutral.”
If you want to contradict the American National Academy of Sciences on the limitations of science, you better think twice before you do so.
It appears to be you who doesn’t understand how science works.
*) and yes, I accept all mainstream science, including evolution. I also assume, based on strong evidence, an origin of life by natural causes. I even have written an
extensive overview article on the topic, with more than 100 references from primary scientific literature, for
Talkorigins.org, a leading evolution website.