Two years ago I found that flat earthers theorist. The first 3 months I was in total denial, like someone "sane" would be. After that, in an exercise of extreme open mindness I started seriously doubth about it. Now, Im pretty sure earth is a sphere BUT in the meantime I have concluded that all NASA, the mars missions, the apollo ones, the rossetta landing, the international space station, all them are scams.

All-of-them. You just have to examine the facts.