Well, if you believe that the book is the literal truth and the word of God, then it was divinely inspired, both the writing and the selection of what to include in it, although I have never heard how modern christians exactly justify the selection.
Your last suggestion only works for Christians if someone actually did get a divine inspiration to do so because otherwise they would be a false prophet who is intentionally misleading people in service of the devil. Not exactly something you should suggest to a believer.
The bible also says that one should be wary of such false prophets and check the things people preach against the teachings of the bible, so getting such a change accepted in the more literal/fundamentalist christian circles would be quite hard.
To me it sounds like a pretty strange idea though and not like something an atheist could just do and get a lot of people to actually believe in it. Unless you want to dedicate your life to your new christianity and become its guru or something like that. But even then most would probably think you're a devil-worshipping sect of apostates or so. The modern world has already brought about all these kinds of "spirituality" where god becomes more abstract and where the judeo-christian ideas are mixed with east asian religious/philosophical ideas and so on but to fundamentalist believers that's just the so-called "new age" scheme the devil came up with to distract more people from the right path.
Overall it seems as though capitalism and consumerism or the false god mammon as the bible may call it are also really good at drawing people away from devoting their lives to serving god. Although with turbo-capitalism and the whole burnout thing, some people are apparently looking back to when things were more relaxed and life wasn't about being able to afford the next golden ApplecalfWatch by next year.
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