But that is the difference between a theory and something proven.
Let me ask you a question and this only requires a YES or NO.
Do you call it 'The Theory of Sunrise'?
You can do, considering there was nothing to state in that "theory" how the sun appears to rise, after all the logical conclusion back then would be that the sun god rode upon the backs of horses or a chariot across the sky, well that would be a theory, unless it became accepted as indoctrination (Which religion did)