Ok, before I throw my 2 cents out here I want to explain my position. Im a Christian who believes in the Round Earth Model. Yep, you read that correctly. The Model not the Round Earth. To further explain the wording.
Do I believe the World is Round, Yes. Do I believe in Gravity, Yes. Do I have indisputable, indubitable, unquestionable, Proof that could be easily explained to even a Child? Nope. Thats why I currently choose to say the Round Earth Model. To have a discussion you have to keep an open mind and be willing to look at the subject through everyone elses eyes.
Now, here is what I have found out so far in this debate. Pictures, Videos, or Personal experiences Do Not Count as proof. Any of these "proofs" can be disputed, explained, or countered by the opposing side.
Like Chicago across the lake. Ive seen tons of pictures of the city, you really can see it... Sometimes. RE say its refraction. Ive seen tons of pictures where you Cant see the city. FE claims its waves, or atmospheric conditions, or your not aiming at the city. I could personally fly to space and snap a Picture of a Round/Flat earth and the other side would claim it was faked.
Suspected Registered flight path by Round Earther

Flat Earth Says

Round Earth says about Flat Earth

Its a never ending cycle of doubt.
We Need a Better Idea.