Right there is your problem, you don't know what a scientific theory is.
Also, who is we?
Theory....key word. And believe it or not I did grad college.
I've learned a great deal in 64 years, but still need to learn a great deal more.
I won't live that long, neither will you or anyone on this earth for that matter.
Probabilities are just that, more then likely possible but who knows for sure?
big difference between a probability and fact.