Let us stay with the first one,

1. What is your proof that the same or a similar event happened with Saul?

2. Remember the Quran is "recounting" the story as something that happened to the children of Israel and assuming it is something the audience knows about Saul. What is your Jewish source that another similar river testing event happened with Saul?

3. If you have none, why should we trust the Quran's uncorroborated (re)telling of a story none of the Jews have ever heard of?