A scientific theory is not a guess. It's evidenced. For those of us who are not scientist it is 'fact' because the details they discuss are things that it doesn't change what we know.
Here's something to keep in mind when you think of a scientific theory, just so you understand better. What you're using, electronics, is many scientific theories working together. Same goes for electricity. You can see for yourself, science theories are very different than what you think the word implies. They are workable, usable things.
You may not be anti-science but you have a thinking that science shouldn't tread in places that makes you uncomfortable. That's just too bad. Science may not answer all questions but it does a good job at answering many and will continue to do so, whether you like the idea or not.
Where did you come from? Stars. You, me and every living thing on this planet and in the universe came from exploding stars. We are star dust. The line between the living and non is a thinner line than you would be comfortable with. We may never know exactly how life started but we'll have a good idea about how. Probably very soon. We have a good idea what happened after it started though. It's called evolution.