I really don't think that plausibility is a stumbling block to religious fundamentalists. They seem to have an ability to 'shut off' the questioning and reasoning part of their mind when it comes to their faith, to compartmentalise it, to resist the questions let alone seek to answer them.
My grandfather was a coal miner, a very tough man. In his younger days he was a bare-knuckle boxer and was a local champion. When he was 'converted' (I believe during one of the religious 'revivals' in the Welsh valleys) he became absolutely committed. He and a few friends built (literally) the gospel hall in their village (we knew it as the 'tin tabernacle' - but not in his hearing!). He believed the bible completely and literally. If thr bible had said that Jonah swallowed a whale, he would have believed that unquestioningly.
It's an interesting point about Galileo (could we equate it to the reception of Darwin's ideas later?). If you ask a 'fundie' about that issue today he'll perhaps find some biblical verse somewhere to 'show' that God said the Earth went round the Sun and if he's a fundie protestant he'll point out that RCs aren't really 'Christians' anyway.
The discussions about man's predisposition to religious or supernatural belief cite societal peer pressure as a very significant factor.
Your comment about the Puritans reminded me of the old quote (can't attribute it, sorry) which said that the Puritans left Britain in search of greater religious freedom - the freedom to persecute each other more than they had previously been allowed to do.
As for the Antipodes - which was the largest island in the world before Australia was discovered?
Australia.
Cheers