I believe eyewitnesses. That's what the gospels are, eyewitness accounts. If you doubt the people who have seen the globe earth from the moon, you have no justification for believing the Bible.
These "authorities" (whoever they are) have been saying the same thing since at least ancient Greece. You have no authority whatever that can demonstrate a flat earth. It's never occurred to me that the earth might be flat. I've traveled enough of it by air and sea. If it was flat, I would know. You should get out more and see for yourself.