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I think that it is better to start with one question at a time approach. So that the believers are not overwhelmed.

I’d pose a single question.
Why we have to constantly change our interpretation of the bible?

If it is came from God (who knows everything) then it should be consistent with the modern days science. In reality, the more scientific discoveries appeared the less literal became interpretation of the bible. Why is that?

I have a good explanation: the bible contains the knowledge of the world that was thought to be true by the human writers at the time when it was written. When our understanding of the world progressed some of the things that we previously thought to be true were proven to be false. Such as the Earth rotating around the Sun, local flood vs the Great flood, the evolution of animals vs creation, just to name a few. So, the bible is just a book which was written by people with no communication with supernatural forces (God).
This is a very simple explanation.

Can you propose a similar consistent with the facts explanation?