And now we shift to the usage of the word "theory." Relativity theory is "theory" but it's proven. Heliocentric theory (the theory that the planets go around the Sun) is "theory" but it's proven. Quantum theory is "theory" but it's proven. I could go on but there's no point because you won't hear it anyway.
When something is proven, it is not longer theory but fact. The earth is not flat. The fact the earth is round is fact, not theory.