Interesting, I've got a degree in genetics and all the problems you mentioned are also present in using UV radiation and/or radioactivity to alter cells, but those methods are functional and extremely tried and tested.
In fact I've used them routinely when I still worked in that field.
Yet here you claim that for microwaves this suddenly becomes an obstacle.
The real reason that it's an obstacle is of course that microwaves cannot alter cells except by cooking them if you truly overdo the energy you put in, but as others have pointed out, sunlight contains more energy than all 'electrosmog' combined.
As per usual with all pseudoscience, it's proponents refuse to look at the implications of their ideas and make up things when challenged.
If the idea would be right, going outside would be suicide, but then again, so would staying inside due to the radiowaves of the sun. And all those who worked on early radar would have been dead in seconds.
As for your other handwave, if your god cannot save this world by interacting with it due to 'rules', then clearly it's also not talking to you, as that would break the rules, and also not responsible for this particular virus, as that would also break the rules. You can't have it both ways.