“Not considering scripture inspired at this point it’s based on the historical record of their content.”
And how do you know the historical record is an accurate and authoritative basis for the Church’s claim?
"And how do you know the historical record is an accurate and authoritative basis for the Churchs claim?"
It's a matter of pure reliable history:
Testimony of the Evangelists - by Simon Greenleaf (1783-1853)
Google is your friend.
Search: "When was the Catholic Church founded?"