The Bible is God's map to lead us to salvation. It isn't a history or science textbook. There is a lot that sounds mythic in it, especially the Pentateuch. But whether it is historic or not, the stories and ideas are important to establish the groundwork for 2nd temple Judaism from which Christianity arose.
...The important things are sin and salvation, so don't worry too much over the minutiae.
Whenever people say the Bible isn't a history or science textbook, they usually do so to dismiss the history and science He presented in favor of the ones mere men proclaim today. The Bible is true on everything it discusses, from creation, to science, to salvation, to the end of the world. We can't dismiss any of it.
When Jesus talked to Nicodemus, He said:
John 3:11-12
11 Most assuredly, I say to you, We speak what We know and testify what We have seen, and you do not receive Our witness. 12 If I have told you earthly things and you do not believe, how will you believe if I tell you heavenly things?
If we can't believe the Bible on history and science, why should we believe the Bible on salvation? I caution caution anyone who would disregard the history and science presented by the Bible and say that salvation is the only important message. God's plan of salvation without the historical foundation of Genesis 1-3 makes no sense. Further, 2 Peter 3:3-9 warns that in the last days scoffers who foundationally had rejected the Bible's creation account and the worldwide flood will reject the Bible's clear teaching on the end - a literal, bodily return of Jesus Christ. So then, disbelieving the beginning provides a great foundation for disbelieving the end.
Don't get too caught up in literal interpretations, for if you reject everything because of one or two things you disagree with, then you can never accept anything.
I think this is bad advice. I encourage people to believe the Scripture at face value, even if they don't understand why or how God did what He did.
Same with Christianity, it won't fit exactly the criteria you want, because Truth usually does not fit our presuppositions.
This is true. Scripture needs to change us to its standard, not the other way around.
Psalm 50:21
21 These things you have done, and I kept silent;
You thought that I was altogether like you;
But I will rebuke you,
And set them in order before your eyes.
Isaiah 55:8-9
8 “For My thoughts are not your thoughts,
Nor are your ways My ways,” says the Lord.
9 “For as the heavens are higher than the earth,
So are My ways higher than your ways,
And My thoughts than your thoughts.