Evolution and the big bang are described as “theories”. I’ve never heard a serious discussion call them “fact”.
They always are accompanied by the word “theory” hence are not represented as fact, rather as a model to support observed data, for better or worse
Every school I went to insisted they were facts
Including college.
( I gave them all hell about only being theories as I’ve been a Christian since 6th grade )
California
Oregon
Washington
Ymmv.