We thought the earth was flat until Anaximander, ~2600 years ago, worked out it wasn't.
Eratosthenes, ~2300 years ago, estimated the dimensions of our lovely blue planet, coming up with a value that wasn't bettered for another 1200 years.
Etc etc etc.
You gotta love those Greeks.
If only the christians hadn't abandoned rational thought and scientific progress in the name of dogma and 'god'.
Anyway, we got there in the end, and to be fair the god botherers aren't doing too much harm these days, they're kind of irrelevant. Mostly amusing, sometimes irritating. (I'm not risking another thread ban by mentioning the obvious exception here; let's ignore the elephant in the room).
@Damocles, you never did tell me if you think Jesus is the son of God.