In primitive culture, you depend on the rain, but if you get too much of it your fields flood and you starve. And surely, everyone living in a rainy area has experienced a flood or two. I don't know. That's a greater miracle than for a bacteria to evolve to a man. I don't know for certain.
Nobody really does.
There are various hypotheses , of course, some of which have significant evidence behind them. But that's what is so magnificent about science. But I don't suppose Dr. Brown would understand that. In any case, this is not an indictment of evolution, nor even of abiogenesis. A theory is not necessarily incorrect because it is incomplete.