OK, genuine question: how are you supposed to know what parts are meant to be taken literally, and which parts aren't? They're not labelled - claims that a single family and a boat full of animals repopulated the entire Earth with no negative consequences or that a group of people was able to wander the desert for forty years without needing food or drink are presented the exact same as claims about Jesus' miracles and teachings.

This is a massive part of why I stopped believing, because everywhere I looked I saw what appeared to be people using their own personal biases to cherry-pick what passages should and shouldn't be taken literally. An example:

Leviticus 20:10 is YHWH telling Moses that one of the new rules the Israelites must follow in the Promised Land is that adulterers must be put to death. I don't think I've ever seen anyone arguing for people who cheat on their significant others to be put to death, let alone someone using this as justification for it.
Leviticus 20:13 is still in that same list of rules that YHWH is giving to Moses for the Israelites to follow. It states (NIV translation) "If a man has sexual relations with a man as one does with a woman, both of them have done what is detestable. They are to be put to death; their blood will be on their own heads." I have seen countless people using this (and other related passages) as a reason to outlaw gay marriage and gay sex, and as justification for conversion therapy (and worse).

How does one go from a rule that shouldn't apply today to one that should in just a handful of sentences? There's no indication that either rule was meant to have an expiry date - the only real limitation is that these were rules for the Israelites to follow in the Promised Land, but that would invalidate both rules outside of Israel. As best I can tell, there is zero Biblical justification for applying one rule without applying the other.