How can I possibly believe a system with so many people who can't agree on some core concepts here???
It's not that they don't agree, but you haven't quite got the details worked out yet. Here's a brief summary that will make it as clear as possible in a short space.
Abiogensis is the hypothetical idea that the first simple life form on Earth originated in some way from inanimate matter. This idea is only a hypothesis; it doesn't have experimental backing. It is also not a part of the theory of evolution (though obviously, the theory of evolution picks up immediately after abiogenesis is hypothesized to occur).
The theory of evolution is what is purported to tell us what happens to life once it has started up, from just after abiogenesis occurs to the present time. The theory of evolution details the history and mechanism of how existing life is said to change or evolve, once that life already exists.
So, does evolution purport to tell us "how we got here?" Well, that just depends on what you mean by "how we got here." In a sense, it doesn't, since life is said to have originated with abiogenesis, not evolution. In a different sense, evolution can be said to be purporting to tell us how we got here, in terms of the evolution of life from its simple beginnings to its current state. Note that in this second sense, evolution claims to tell us how we (humans, and other modern life) got here, but not how life originated in the first place, which is abiogenesis, not evolution.
As you can see, it's easy to see a contradiction about "how we got here" if it's not made clear what you are specifically talking about. But that's not an actual contradiction, just sloppy use of language.
I think this will make it a bit more clear for you.
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