We can see germs in a microscope and waves in the double-slit experiment. Not so with gravitation or bending space -- they have yet to be seen or detected. They are entirely undiscovered and mysterious in science.
Let's talk about the difference here... Virus' are actual THINGS you can see in a microscope. Gravity isn't caused by invisible particles in the air that haven't been detected, it's caused by the fact that objects attract to larger objects. Claiming that gravity doesn't exist because you can't see it is like claiming that a universal accelerator doesn't exist because you can't see that. As you know, you wouldn't see the force caused by the universal accelerator above the ground because the UA is BELOW the earth. The same principle exists with gravity. You're talking about gravity like there are magical little gravity particles in the air that pull everything downward. No wonder you don't believe in gravity. You should pick up a book written in the 20th or 21st century on astronomy and astrophysics, and you may properly understand how physics work
See, the laws of gravity have been proven. Not only because things fall to earth, but because celestial bodies in space (stars, planets, moons, planetary rings, satellites, etc.) abide by the same gravitational phenomenon we experience on Earth. Gravity not only [magically] pulls things toward earth, but it also [magically] keeps planets and comets in orbit around the sun, keeps stars in (somewhat of an) orbit in a galaxy, keeps moons in orbit around planets, and keeps satellites in orbit around the Earth. But, I guess if you just deny the laws of physics, anything's possible.
Your earlier question, "if you jump off a chair, are you falling or is the Earth rising..." that argument is relative. To me, it feels like I'm falling. It kind of look like the earth is rising... yes... but, to someone who's watching me, it looks to them like I'm falling. If we drive 100 miles per hour next to each other, would you conclude that we're stationary and the whole world is moving backwards? Perception doesn't define reality. So, if you think the world is rising, that doesn't mean it is. Similarly, just becasue it FEELS like I'm falling, it doesn't mean I am. But, when it comes to perception, when objects (parts of rockets, etc.) fall to earth, it looks to me like they're falling to earth rather than the earth rising to meet them... Just like Shumacher-Leevy 9 FELL to Jupiter rather than Jupiter RISING to meet it. But, again... if you just deny physics and everything we know about space, I guess anything's possible.
But, let's talk about that. Let's give you the benefit of the doubt for a second. Let's say gravity ISN'T real. Let's say that the earth is rising. There is still NO proof of any universal accelerator, there is NO proof that the sun and moon are 32 miles across of whatever garbage you guys say it is, there is NO proof of any sky gears, bendy light or moon shrimp, and there is still NO proof that the earth is flat.