A global flood and Jonah and the whale were two of the biggest obstacles for me to become a Christian. I wanted eternal life so I accepted these stories as figurative not literal.
What changed my way of thinking was Matt 24:37
But as the days of Noah were, so also will the coming of the Son of Man be. 38 For as in the days before the flood, they were eating and drinking, marrying and giving in marriage, until the day that Noah entered the ark.
It occurred to me I would be calling Jesus, the very person I was relying on for salvation, mistaken. I would have to face him one day and say, we'll perhaps you meant to say like an ark or partial flood, or even easier to accept, someone else attributed that to you Lord because surely that is not what you meant for us to believe.
Sine Jesus specifically mentions an ark and Jonah, I accept these as literal events based on faith. Sure, it helps sea creature fossils in the Andes and other mountains but the bottom line is these events are hard to believe. Then again so is the resurrection. It seemed wrong to me I would be willing to accept what Jesus did to avoid hell, yet reject what he said to avoid looking silly. Call me silly then because I believe it, even if I can't fully explain it.