Here is some information that is from The Bible and excerpts from the article “Neoplatonism” by P. Hadot in the New Catholic Encyclopedia etc. that support belief in an apostasy.
Why was a Restoration needed? Haven’t we always had the Bible?
If there was an apostasy, why are you the only ones to realize it?
Why do you think Greek philosophy caused the apostasy?
To see the answer to the questions you posted from an LDS perspective see the following link.
jefflindsay.com/LDSFAQ/FQ_Restoration.shtml#neo
re: the link above…
" This work is solely the responsibility of Jeff Lindsay and has not been officially endorsed by the Church."
Again I am not here to tell you which is right or wrong but was seeking the differences and better understanding of the Catholic beliefs. I am not pushing my views but I will offer the LDS The church of Jesus Christ of Latter day Saints position (my religious beliefs) because it was requested.
Happy Valentines day to all!