The Bible indicates that there will be a great apostasy during the end times. The “great apostasy” is mentioned in 2 Thessalonians 2:3. Scripture refers to it as the “falling away,” or “the rebellion.” And that’s what an apostasy is: a rebellion, an abandonment of the truth. The RCC has put many of their "traditions" over, above, and outside what scripture teaches.
Biblically speaking, the true “mother church” is the church that is described in the book of Acts and the New Testament epistles. In the biblical mother church, you will find no mention of priests, cardinals, or popes; scripture refers to them as elders and deacons but nowhere will you find Mary being adored or saints being venerated. In the biblical descriptions of the true mother church, there are no infants being baptized or elements of the Lord’s Supper being transformed into the body and blood of Jesus. So, no, the Roman Catholic Church is not the "HOLY mother church."