It is correct to say that Paul wrote this, and other humans did write the rest, but your opinion shows limited knowledge and authority on this topic. Paul's writings are absolutely authoritative - this is beyond the scope of this discussion, but you could google that and be more informed.
Massive fail there. This figure gets thrown about by amateurs, but it is the number of christian organisations in the world, and in no way reflects "variants" in any way shape or form. Most of this number is independent small churches in non western countries, like africa, asia etc.
No the main reason they differ is location, language, cultures.
The single basic verse that defines Christianity is, John 3:16. and anyone that believes in this, is a Christian. Now you tell me, what are all these variants on this verse? No need to look up 30,000, just give us one.
this theory has no substance at all.
It's really irrelevant though, the doctrines of Catholic v Anglican v Pentacostal or whatever doesn't matter to ones destiny or this topic of bible interpretation. There is only one thing that matters, a person is either saved or not saved and there is no misinterpretation of that
Absolutely. the Word of God doesnt change for those who dont believe too.