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Evolution and the origin of life are separate subjects.
Dawkins is unable to explain the origin of life because nobody is able to explain the origin of life. Yes, an intelligent designer is a possibility, albeit a very unlikely one given the evidence we have. There's lots of research going on, and there are a plethora of possibilities and hypotheses. It was so long ago there's a good possibility we will never have a solid theory.
The Theory of Evolution covers what happened given that life existed, so it is no weaker becasue we can't explain what went before.