I'm 70. I was well and truly alive in the 70's. There is more computer power in a modern calculator than in the computers on the lunar craft and at NASA's control room. The landing was televised all around the world.
The PC was invented in 1974. Do you know the amount of computer power you need to run editing software? Obviously not. My first PC had 8 megabytes of RAM. I had an Amiga with a paint program. It took minutes to update a page. The PC was a little faster but the software was horrible. Photoshop was released in 1987.
Gravity depends on mass. That's why the moon has no atmosphere and Mars 1/3 of Earth's. If the earth is flat, we'd all be able to jump 60 feet. If we could breathe at all, that is. Your magnet analogy is flawed. A nail will not float (because of gravity, of course) but air has little mass. Unlike a nail, it rises when heated. So there has to be sufficient attraction to keep the air in place. The attraction is gravity. With a flat earth there is insufficient gravity to hold the atmosphere.
Point 2 is the funniest thing I've heard in weeks. How much power do you think Satan has? Over the world, plenty. Over a born again Christian, none. I bind the enemy before I go to the supermarket. I am always clothed in the armour of God. If there was an end to the earth (there is not) and Satan was there, I'd be pushing him over the edge, not vice versa.
Not sure what you are replying to, I did a list. I know that the official computingpower was like a poor calculator from the eighties. Point is, we do not know, and what the military had unofficially is not known. Just as today, where manufacturerrs have developed the prototypes they will release the next 5 years. And I believe the computer you point to in 74, was the first one released on the private market. The military was way ahead, and if this project was planned for 4 years, surely they could let an amigatype secret supercomputer in 68, and let it buzz for a year. Other way to photoshop without PC too.
Gravity may depend on mass, but not shape. One thing affecting another thig is all. Gravity works regardless if you sit in a square box or oval chair. Man has not been to mars, so we know nozzing of that planet. Why could we jump 60 ft if the earth was flat, there is no logic here. Float! What has floating to do with anything? Nails also lack brains and will, and evolving body and mind.
The evil one has a lot of power, controls most on earth. No physical powers of course, but enact wickedness with his children doing bad deeds in his name. Look to Hollywood, and the silly valley next to the russian river.