1. Did the old testiment always have a concept of Satan or was it added later?
2. If so, why was it added? (For example some of the scriptures in the Bible that were present in Coptic scrolls in the Nag Hamadi library e.g. the "Exegesis of the Soul" were destroyed due to a clearout of suspected heretical material in the Bible that may have crept in over the centuries and so do not feature in the 1611 KJV many centuries later.)
3. Was it added because devout people were afraid to depict actions of God as being negative and they were scared of being seen to blaspheme?
4. If Satan is there to carry the burden of all evil within the world, are actions such as the anger of God in the old testiment, good or bad, or neither?
5. Is there any clue in the Bible that gives indication as to why God's anger is not the responsibility of Satan?
6. Is there an official stance on this, and is it based on the scriptures, or by a figurehead, such as say a saint or a pope?

1. Did the Old Testament always have a concept of Satan or was it added later?
2. If so, why was it added? (For example some of the scriptures in the Bible that were present in Coptic scrolls in the Nag Hamadi library e.g. the "Exegesis of the Soul" were destroyed due to a clearout of suspected heretical material in the Bible that may have crept in over the centuries and so do not feature in the 1611 KJV many centuries later.)
3. Was it added because devout people were afraid to depict actions of God as being negative and they were scared of being seen to blaspheme?
4. If Satan is there to carry the burden of all evil within the world, are actions such as the anger of God in the old testiment, good or bad, or neither?
5. Is there any clue in the Bible that gives indication as to why God's anger is not the responsibility of Satan?
6. Is there an official stance on this, and is it based on the scriptures, or by a figurehead, such as say a saint or a pope?

I study religions as a hobby but I don't really worship them. I like to read scriptures. I have read the 5 vedas, Mahabharata, Tuttvartha Sutra, parts of the Tripitaka, The Dhammapada, The Egyptian Amduat, The 12 Gates, The Zend Avista etc etc. Religions interest me, I find them absolutely fascinating to read, and to reflect on. I don't see scriptures as being "right" or "wrong" or "true" or "false" for me they seek to encapsulate a certain amount of wisdom that we can all learn and benefit from so for me, i have no personal conflict between religions, nor do i get offended by strong religious opinions, nor do i feel prolonged loyalty to any particular religion or scripture; although I would be lying if i said I didn't have favourites!

So what I am trying to understand is, as Christianity is monotheistic, why Satan features in the bible at all.

I study religions as a hobby but I don't really worship them, although they do dramatically affect how I perceive the world. I like to read scriptures. I have read the 5 vedas, Mahabharata, Tuttvartha Sutra, parts of the Tripitaka, The Dhammapada, The Egyptian Amduat, The 12 Gates, The Zend Avista etc etc. Religions interest me, I find them absolutely fascinating to read, and to reflect on. I don't see scriptures as being "right" or "wrong" or "true" or "false" for me they seek to encapsulate a certain amount of wisdom that we can all learn and benefit from so for me, i have no personal conflict between religions, nor do i get offended by strong religious opinions, nor do i feel prolonged loyalty to any particular religion or scripture; although I would be lying if i said I didn't have favourites!

So what I am trying to understand is, as Christianity is monotheistic, why Satan features in the bible at all. There must be a reason for it, and I've no doubt it's a good reason. And my concern is that by not understanding this reason, something fundamental to Christianity is missing from my understanding.