I once believed the earth was flat.
Why do you think that so many people believe that the earth is flat?
Because a flat earth gives a better understanding of the world around us
I think it is admirable when people are able to admit their faults. I think there are other ways to understand the world around us. It is good that you don't believe in it anymore.
I will take it to the grave. I care about the truth, the NASA is lying in order to make money.
I am not sure that NASA is lying to us when there are pictures of the Earth being round. Admitting that you are wrong was a good first step, now you need to stick with it.