If it's nonsense in all things, then how can people live without it? And if they can't live without faith, then how can we have hope for a better life? If we can't have hope, then why not just commit suicide?
A lot of people in America live in poverty and have other kinds of terrible lieves and have faith that things will get better for them. How is that nonsense?
You are adept at confusing completely different concepts that are sometimes referred to with the same word.
You are referring to hope that something will become true (e.g., that one will no longer be sick or poor), which it not at all the same thing as faith that something is true (e.g., that God exists). Hope is neither rational nor irrational. It is merely a wish that things will get better. Evidence that it will actually get better is irrelevant to whether hope is rational, because to hope for it doesn't mean to believe it definitely will be so. In contrast, things that are already in fact true should have evidence showing they are true and there should not be evidence indicating they are false. To have faith that something is true means you are going against rational thought and against the evidence to conclude that it is in fact true, when nothing supports it.
A cure for cancer is a possibility consistent with everything we already know. Thus, hoping for a cure does not require believing anything that goes against reason or the evidence. Believing their is already a cure or that there is already a God that will cure it is irrational faith that does go against reason.