I gave reason to rule out your moon argument for supporting a flat earth and you didn't address your consideration of it at all. That means you are dogmatic about this. What's under the foundation of the Universe? What holds it up? Where does the person who created the foundation , flat earth and firmament reside? What's outside of the firmament? I am very open to learning knew things and will entertain any perspective. The earth can be flat and spherical at the same time in quantum theory. What is it that a flat earther hopes to gain by an adoption of this belief? We can know NASA lies to us and the earth can still be spherical. God can still be the Creator of all and the earth can still be spherical. ETs, and God can both exists and the earth can still be a sphere. What is it flat earthers want from the rest of us? Sincere question. What is to be gained?

My apologies for the delayed response. Here's how I understand things....
All of my conclusions are based off of empirical evidence and the scientific method. I can look up and verify through my senses and critical reasoning that that the stars, moon and sun exist. I make no claim to their nature nor composure. They are luminaries that rotate above our plane....believing anything else, well that is by definition, dogmatic. In fact, the entire premise behind the heliocentric model and globular bodies of matter firmly depends on religious beliefs and pseudoscience. To answer the latter part of your post, I do not claim to know anything about our Earth other than what is observable, measurable, and repeatable. The depth, vastness, what lies beyond or outside of the firmament is anyone's guess. What has never been scientifically proven in regards to earth are curvature, motion and an atmosphere without a container, all of which are disproven using physics, fluid and thermodynamics.