Like it or not, he introduced European Christian culture in California as much as the Puritans did in New England. Just the way it was.
That's great, but like it or not, the Founders were so named because they Founded a Constitutional Republic by Declaring Independence from the global superpower of the day, risked theirs lives and treasure and sacred honor, won the war against all odds, and then drafted a document that is one of the 3 most important and influential writings in the history of mankind, while also refusing to be named kings of the new nation, instead sticking to their principles of limited government.
THAT'S what a Founder is, not just any missionary successfully spreading The Word in new places on this continent.
I wouldn’t say that he had the effect on his Spanish colonies as the Puritans did on New England.
Mexico never became anything like New England, California was just as lousy as the rest of Mexico until the Americans came in and created it as a great state.