Gravity is that force that will crush you when I drop a brick on your head from space.
The brick will 'crush' me, not gravity. If gravity is not magical, why can't you tell me how it works?
What do you mean by that? Give a more specific question.
Even if you don't believe in gravity, I'll put the same spotlight on you. How do things fall? That's all it is. It's what causes things to fall.
When the planets came close to the sun, but were a bit off, the Sun had enough mass that the planets "slipped", and the sun keeps the planets "falling"...but they're far away enough that they are stuck in orbit.
That's the best I can do. But, a round Earth has MUCH MUCH MUCH more evidence than a flat Earth ever will. It's not like people were always born thinking the Earth is round. It got enough evidence that it seemed much more plausible than a flat Earth, which caused normal people to actually believe in it.
What I want to know is WHY you would even believe in a flat Earth instead of simply accepting the truth. I bet it's just to "break away" from everyone else, to give yourselves a false sense of purpose. Just STOP! Why would you believe there's a GUARDED FUCKING ICE WALL that's BEEN GUARDED EVER SINCE HUMANS FIRST CAME ABOUT, and that CELESTIAL BODIES WILL ORBIT THINGS IN COMPLETELY MESSED UP PATTERNS? It's explained PERFECTLY, and your idea is to explain it in a way that doesn't work even 25%, and argue that it's true.