They didnt forget it, they dont know it. Gods Word is just a tool they wrap their deception in. So according to their counterfeit religion with its doctrine and traditions - they probably instituted another rule - its a sin to blaspheme their idol Mary. Like the Muslims, they have their own set of requirements, like death to the Jews and Christians. Different religions have their own set of rules and dos and dont s.
Its has nothing to do with Christians who follow The Truth - His Word that He gave us, His Church.
INDEED.
>>His Word that He gave us, His Church.<<
Mathhew 16:16-18
16 Simon Peter answered and said, You are the Christ, the Son of the living God.
17 Jesus answered and said to him, Blessed are you, Simon Bar-Jonah, for flesh and blood has not revealed this to you, but My Father who is in heaven. 18 And I also say to you that you are Peter, and on this rock I will build My church, and the gates of Hades shall not prevail against it.
The Aramaic follows pretty closely word for word.
The line of succession does not result in Reverend BillyBob and his Sisters Of the Gospel Choir.