Are Roman Catholics all so gullible that they’ll believe anything a supposed “apparition” of Mary tells them?
Yes they are.
And they will kneel before the apparition.
They will pray to the apparition.
They will further rely upon the apparition to save them.
The apparition of Akita said this: I alone am able still to save you from the calamities which approach. Those who place their confidence in me will be saved.
Now, contrast with what Scripture records Christ as saying:
6Jesus said to him, I am the way, and the truth, and the life; no one comes to the Father but through Me. John 14:6 NASB
Only one of these statements can be correct.
I'm sticking with what Christ said.
Will the Roman Catholic reject the apparition and follow Christ and Christ only?
Not all. Believing in “apparitions” is not a requirement of the Catholic religion.
I would say that yes, most are, but there was a time, when some of us did too. Of course, those days are so far back, they are almost antediluvian. I am just not real fond of false doctrines. 😁