Only if the adherents of scientism admit to being faithful.
Umm, no. My own answer is the correct answer: I don't know. Most people simply can't handle that truth and prefer to make up fairy tales.
But regardless, no matter what answer one finds satisfactory for the origin of the Trinity then from a rational standpoint that same answer will always be equally satisfactory for the origin of the universe, which is why the false dilemma that was set up by OK is a meaningless argument, and a fallacy.