What if Christianity somehow condemned overseas exploration, and that was strictly enforced by the Pope and every European monarch? What happens?
???If Jesus were the kind of leader who said that - and what 'overseas exploration?', then his religious movement wouldn't go anywhere, and his opinion would be irrelevant.
It was because he preached about the Kingdom of God and relations between people rather than politics that allowed a) his movement to avoid being crushed, and b) people to WANT to join it. (Well, that and the fact that he was God

- but God's not stupid and he wouldn't have preached things that didn't work.)
If he had preached weird geographic ideas, he'd be just another one of the numerous Messiah-wannabes who were a dime a dozen in the area at the time.