The purpose of The Christian and The Muslim Creation Story is so Muslims and Christians know where and how their religion started. The manner of these stories is imperative and confident. They were written by people who know what they were talking about.
The literary format is the same for both stories. There is an introduction explaining the religion, then the creation story, then a closing with the main parts of the story.
The style for both stories is expository because the author is explaining and defining the religion and the creation of it.
In the Christian Creation Story, there are lots of imagery devices in the creation story when the author is talking about the first 7 days. There's personification when they talk about the serpent animal.
In the Muslim Creation Story, there is a lot of personification when God makes the first man out of the soil.