Peter Pedant - “... the Trinity is fact...”
It depends. If you mean, “There is an idea called the Trinty that means the Father, the Son and the Holy Spirit” then yes, that is a statement of fact. If however you mean that the Trinity is a literal truth, (ie. God, Jesus and the Holy Spirit literally exist and are all just different facets of the same divine entity called God) then I certainly wouldn't use the word “fact” to describe a belief in such patent nonsense.
I am reminded of this quote from a chap called Peter Boghossian, “God sacrificed Himself to Himself to save us from Himself”. How deranged is that?