The evolutionary theory offers a very simple explanation for that.
Also you’re argument from personal incredulity fails. The fact is that the evolutionary theory does not address the origins of life, no matter how many times up set that straw man up it does not change the facts.
Darwin was not trying to explain the origins of life
“It is no valid objection that science as yet throws no light on the far higher problem of the essence or origin of life” (Darwin, Charles. The Origin of Species. 6th edition, 1882. p. 421
Science does not allow you to change to facts to fit your inability to accept what the evidence clearly shows.
That is more that a complication it is one of the many facts that falsifies the young earth flood scenario.
Without origins, there is no life.
Science may be able to explain variation within species and natural selection, Even creationist websites don’t deny those aspects of the ToE (if you’d ever bothered to read some of the articles, you’d have found that out) but there is NO reasonable explanation for origins.
I know what evos keep saying about them being separate, but it is unreasonable. The distinction is simply a break in the continuum from the initial formation of simple chemicals to the most complex to the point of what we define as life, that is just for the convenience of giving some sort of credibility to the ToE. Since spontaneous generation has been disproved, that complication has to, and had to, be removed from the ToE.
You can’t logically and honestly keep saying that you look at how life evolved from one common ancestor and then just stop cold when you get to the first one and pretend that it’s irrelevant as to where that came from. If it’s relevant where everything else came from, it’s reasonable to ask where the first came from.
What were the common ancestors of the bacteria and algae? From what did they evolve?
The long and short of it is, that there is simply no reasonable explanation that science can give for the formation of life at all, whatever they think that they can explain about what may or may not have happened after that.
Plus, origins not being part of the ToE is not a universally held view outside of FR, and that has been rehashed many times already.