This is kind of a pet topic of mine. I have no problem with people practicing their religions, and I’m religious myself. I even have some pretty out there views on some things, which you will know if you read through my site. However, the lack of scientific literacy in my country is astounding to me.
Evolution is real. It is a scientific theory. This means it has been tested in ways as rigorous as we can devise, we have observed the process, found supporting evidence, and not found contradicting evidence. This means, unless we make some new discovery that throws a gear in the works, evolution is a good explanation for how complicated life arose from simple life. Such a new discovery is likely to only cause us to refine our view of evolution though. Basically, that evolution happens is a fact. How it happens is currently the domain of theory.
For an example, consider gravity. It is also a theory. For a long time, we used Newton’s laws of gravity to model it. We still use these laws in most circumstances, since they get the job done. However, we also discovered that at very high speeds, gravity does some funky, unexpected things. This is where Einstein’s theory of general relativity comes in. It is a more specific theory of gravity, but it served to refine our knowledge of how gravity works, not invalidate Newton’s work.
This is what will likely happen when the next great discovery on evolution is made. It will refine our knowledge and make it more specific, rather than invalidate what we already know.
In any case, I think if anyone told you gravity is just a theory, you’d probably laugh at them. I hope you would anyway. It is a theory, but it’s quite an important part of our knowledge.
If someone tells you something is just a theory as a way of dismissing it, it’s because they don’t understand that scientific theories have lots of testing and observation go into them before they are called theories. They don’t just think something up and call it a theory. When they’ve just thought it up and are getting ready to test it, it’s a hypothesis. Don’t let the way words are used casually detract from their meaning when they are used in a scientific context. Understand that in science, words are used very precisely, to be sure everyone is on the same page.