I know the earth is not flat because I can see the earth's shadow on the moon.

Also sunrise and sunset exist, they wouldn't exist under the flat earth model.

Also the fact that every indigenous culture thinks the earth is round.

Literally just the Catholic church (who no longer claim the earth is flat anyway)

And the CIA(who obviously only claim the earth is flat as a disinformation psyop to break up the 9/11 truth movement)