It was a theory until it became proven science.
*sigh*
Sure, whatever.
You're obviously using definitions of "theory", "proof", and "science" that are never, ever used by scientists.
The "theory" of relativity is the best-"proven" theory ever in the history of "science", yet it's still called a "theory".
Number "theory" is a set of provably true statements, yet it's still a "theory".