Unsubstantiated anecdotal evidence. I must say that Reformed doctrine is built on even less...
Less than what the Catholic Church uses to justify the papacy, one verse?
Or maybe like the RCC and their doctrine about......
The Immaculate Conception- zero verses of Scripture.
The perpetual virginity of Mary - zero verses of Scripture.
The Assumption of Mary - zero verses of Scripture.
The priesthood of the Catholic Church - zero verses of Scripture.
Papal succession - zero verses of Scripture.
Canonizing saints - zero verses of Scripture.
Praying to saints - zero verses of Scripture.
Purgatory - zero verses of Scripture.
Indulgences - zero verses of Scripture.
Celibate priesthood - zero verses of Scripture.
And since there is so little Scripture to support so much of Catholic Church doctrine, the RCC has to dictate that the traditions of the *church fathers* are of equal standing with Scripture to justify their fantasy fairy tales that they made up centuries after the fact and threaten church members with eternal condemnation (maranatha anathema) for not believing them, because otherwise nobody in their right minds would believe them.