Not so - because in order to understand that definition, you still need some specific physics knowledge.
If that was true, then nobody could ever learn physics unless they already knew it. And yet, people manage to learn physics from scratch all the time.
A scientific definition cannot be understood per se, without reference to some physics theory.
Of course it can. Technical scientific terms are always defined in terms of simpler concepts. At some point, those concepts are everyday, familiar concepts.
No knowledge is completely disconnected from other knowledge.
Do note that the "everyday, familiar" concepts are still something we learn. They are not a given. Also, we pick up a folk metaphysics which we tend to take for granted - it is within those folk metaphysics that our understanding of specific theories starts, and often, remains.
Besides, you are not really disagreeing with what I said - read again.
And yet when it comes to learning about what religions say about "God", this basic principle of learning is often being forgotten - as if when it comes to God, we wouldn't need to first have a specific basis for understanding. Ie. some knowledge of scriptures.
Does it not matter to you whether what you believe is true or false?
That depends on the topic in question - whether it is a topic at all that can reasonably, with foreseeable means and effort be assessed as either "true" or "false".
Almost no evidence is conclusive of anything. All evidence tends to support a view, or tell against it. One would assume that if God exists as advertised by the religious, then their would be some reasonable evidence that tended to support the existence of God. It doesn't seem to me that it would be stupid to ask somebody who believes in God to provide at least some evidence for that belief. If there's no basis for his beliefs, I would ask why he believes. That would seem to me to be a sensible question.
Then ask them.
I don't see why knowledge of God has to be "supreme" knowledge of the kind you're talking about here. I think a lot of people believe in God because they believe they have personal experience of God, not on the basis of First Cause and All-Powerful Creator of the Cosmos, but on the basis of "God helps me when I'm in trouble or feeling low". That kind of thing. Does that kind of knowledge of God not count for anything, for you?
That kind of knowledge is tricky. It does not seem to be transmittable from one person to another, and in effect, often serves as a means to assert oneself over others.
I don't doubt that many people who claim to believe in God, in fact believe in God. But many of them are giving nonsensical instructions as to how to arrive at that belief - instructions that are impossible to act upon or would require one to be immoral or corrupt in order to act upon. And this, and not the lack of evidentiary support, is my problem with them. I don't have a problem with accepting that currently, I might have no evidence for the existence of God or that they cannot present it to me. I accept that I would first need to have certain qualifications in order to come to that sort of evidence. However, and this is the crux, the instructions they often give are impossible to act upon.
Instructions like "You need to be 100% honest in your request for God to show himself to you", "You must be willing to give up your ego", "You must accept the consequences of God making himself known to you before he will make himself known to you", "You have to be willing to give your life to God, without that, you won't know God", "You must love God freely".
Importantly, these are typical problems I encounter with Christianity.
I don't know all that much about Hinduism, but I do know that it is vastly different from Christianity, that arriving at a belief in Krishna might be completely different than arriving at a belief in Jehovah.
There are some significant differences between religions. The usual Western atheism is calibrated against Christian notions of God, but I find it is rather pointless against some other notions of God.
What you are saying above presumes there is such a thing as objective reality. Philosophy has aptly been pointing out for millenia how problematic the notion of objective reality is.
Strangely, this only seems to bother philosophers.
Scientists take objective reality for granted.