Well steve8714,
This is the quote from the article, which you are mangling horribly:
“This is what Rome teaches is necessary to be believed and practiced for salvation.”
Nothing there about necessary and sufficient. But as they are de fide doctrines, you MUST hold to them or you are not following the authority of the RCC, risking your very soul for not doing so. Thus they are necessary to be believed, though the practising part just is common sense, unless you want to experience Purgatory for longer than you can avoid.
In all frankness you are not a reliable source for Catholic teaching as your anti-Catholic bias is apparent in almost every sentence.
The truth is that most Catholics dont study doctrine in depth, particularly doctrine on justification. Justification is a Protestant issue. It is protestants who are stuck in the 16th Century and have to be in order to justify their existence.
It is ridiculous to believe that Christ intends the Church to be a jumble of constantly dividing and contradicting bodies of individuals each recreating Christianity by their independent interpretation of scripture. Protestantism is a play to the ego. I, I, I, get to decide which scripture means. I had a job as a painter during the summers in college. One ofthe other painters was a pastor of a small storefront church. He taught for years that divorce was wrong——until he had marital problems. Then, poof, he was spending lunch hours trying to convince his co-workers that divorce was permitted by scripture. He changed his teaching one day in a sermon and his little storefront church divided into two even smaller churches.
If this crap is the Church, then Christ is not God. If Protestantism is the true Church, then there is no God at all.