The is a theory, but guess what? When scientists use the word , it has a different meaning to normal everyday use. That's right, it all comes down to the multiple meanings of the word . If you said to a scientist that you didn't believe in evolution because it was "just a ", they'd probably be a bit puzzled.
You've been told that "evolution is just a theory", a guess, a hunch, and not a fact, not proven. You've been misled. Keep reading, and in less than two minutes from now you'll know that you've been misinformed. We're not going to try and change your mind about evolution. We just want to point out that "it's just a theory" is not a valid argument.