This is an assumption because science has already, tried this and failed.
Besides DNA are instruction that need correct coding for it to be useful. Not only that but we have thousands of lightning strikes all the time and they don't produce life.
This is a fallacy with scientists that a cell can evolve into what we see. They have not been able to do this in a lab or any other experiments. There is no evidence that it could happen at all or did.
The holes in evolution are major flaws in the theory, because over time they should be answered, but the the research and discoveries, do not fill those holes , but actually stall the theory altogether. It is just that some scientists what to jump the gun and claim it as a fact, before they have the evidence, solidly in place. This is to say 'WE' are right come and listen to us.
Scientists doing the experiments on the beginning of life, can only show that it took intelligence to do that ( scientists in a lab). Which is creation. They can only observe it happening on it's own to say that it did happen that way.
They can't win with this. Unless they do find it happened somewhere.
About survival , where did a cell get this from? How does a cell know it has to survive? Where did it get it's ability to copy itself? It can't just split or crush itself, it is a very amazing thing that a cell can copy itself. Also a cell can't mess around it needs to do this faster than it dies off. And it had to do this with the very first cell of life. Scientists have not answered any of this.
Actually it's been tested and proven possible.
When the right particles of hydrogen, oxogen, carbon and whatever else is used (all of which can be found in the dust of a star), a simple charge does produce microscopic DNA life outta the cluster of particles. The lab used electricity to charge the test particles, but lightening is the most logical natural way that is plausible.
Lightening doesn't produce life! And it doesn't act by itself. The right amount of particles along with water are all equally important to the charge. Lightening is just the charge that can contribute to life evolving. Life is. It is not produced, it is only converted - similuar to energy.
Now the microscopic DNA life becoming what we see today, well that's a long process that can only be proven in steps. I see no problem with evolution until it gets to human evolution. Our human evolution has unanswered questions that I refuse to ignore, so I look for anything possible.
I still think natural causes is a possible explaination to the rapid human evolution, but if all our evolution was natuiral, I need some of that 'science evidence' stuff to prove some drastic envirmental conditions during that time, and a fact laced explaination of why all 3 common ancestors (monkey, man, and ape) flourished in such different directions without an apparent threat of perishing without adapting. The 'Missing Link' would be nice too
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As for cells reproducing. All life reproduces. It's just a matter of 2 compatible cells coming together, and reproducing something that has a little of both. Opposites attract, in life we look at male and female. With microscopic life, we don't use male and female so in science we look at positives and negatives. Even atoms turn to positive and negetive Ions - regularly, which frees electrons. A positive cell finding a negative cell and reproducing a new cell and/or cells.
... and so it begins, as it always was, and always will be.