You said God inspired a 24 hour period.
No that's not precisely what I said. Again, go back and read. Familiarize yourself with the arguments.
You're taking a narrative and comparing it against itself and saying this is what it means.
Not exactly. We are reading a narrative as narrative, and comparing narratives structures with narrative structures. This is probably a bit more literary a discussion then you are prepared to have and than this forum is geared for. But simply put, when understanding texts, you must understand its genre, and compare grammatical forms to the way grammatical forms are used in other identical genres.
But if you read narnia its also a narrative
No, Narnia is a fantasy, not a historical narrative. There is a big difference.
And you can see that it is an incorrect contention.
...Narnia doesn't exist and the author doesn't want us to interpret it that way.
But the world that God created does exist, and the literary form that he communicated it to has nothing in common with Narnia.
The contention is the Genesis creation account (like narnia) may not have been meant to be taken literally in the scientific sence but getting a point across especially when you consider similarities from other works of the same period by the same culture.
That's another bad contention because the creation account is not like Narnia. And when you consider other works of the same period by the same culture, you have none. When you compare similar works from different cultures, you can understand that Moses was writing a polemic or an apologetic against false beliefs about the origin of the world.