Used to be 98 percent sure in that belief. I could never be 100 percent because I am not an expert in the fields of science or math or physics, and #2, I don't have the means to travel to space to confirm that. However I still am more inclined to believe in a spherical earth than a flat one.
But then I started seeing some strange things that didn't add up in spacewalk videos and even the Redbull space jump fakery, and then the Bezos launch that didn't even come close to reaching so called 'escape velocity. At that point, was the first time in my life I started to question my worldview and whether we have all been brainwashed. At least in the way NASA and Google earth has presented reality to us.
Then one thing after another just didn't add up, like that we still do not to this date have any full 360 degree video in each direction on the same footage on any space walk.
I then realized that in each spacewalk video in orbit, the earth was turning at a different speed in each video, and in one video it wasn't turning at all. But the glitchiness of a lot of videos in anti-gravity as less smooth and less believable than in some movies which executed the studio tricks a lot more smoothly.
Then I saw this documentary called American moon and that was when I knew the moon landing was obviously a total hoax. At that point I really started raising my eyebrows at a lot of things may not seem like how we have been fed to believe them.
But of course, none of this proves that the earth is round, but I have no reason to believe that humans have ever been to space.
On the size and/or shape of the earth, that 98 percent surety has gone down to the 70's percentage after seeing this shocking video where the guy uses physics, mathematics, and photography and infra-red photography science to show that real life observations with lens, distances, etc, do not match the model presented to us by Google earth or NASA.
I'm not claiming the earth is flat, but the model we have been fed is not accurate and there is strange sketchy stuff going on as people start discovering things with gadgets and devices. All I would tell you is if you believe in a spherical earth, but just remember that you should just take your beliefs with a grain of salt... whatever beliefs they may be, and that the only way you can be 100 percent sure that the whole globe model is not a hoax is by experiencing first hand any evidence. Because there can be loads of theoretical and mathematical data based on shaky foundations. And that has even happened in many fields of science including medical shenanigans.
Good luck.
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