We do so because Catholicism is counter to scripture. We are told to stand on the word of God. Not "it could have happened" from the Catholic Church.
You wouldn’t have the Bible without the Catholic Church, what you preach is 2000 years and 2 continents and a vast ocean removed from the time of Jesus. Christ founded a Church not a book.
Matthew 2:23, “And He went and settled in a town called Nazareth; that there might be fulfilled what was spoken through the prophets, He shall be called a Nazarene.”
Where is this prophecy mentioned that he would be called a Nazarene?