And you know this? How?
The Holy and Apostolic Traditions of the Church, through the Holy Spirit guided Magisterium has affirmed this and that out weighs any and all skepticism or petty objections. Catholics, like many Protestants are not blinded on this issue by the lens of Scriptural Exclusivity that constitutes the modern fringe Protestant doctrines devolved from Sola Scriptura. We see the entire spectrum of the Revealed Word and rejoice in Her blessedness.
The Protestant demands that we cover our eyes with the dark filter of their heresies and agree to see only what they see as a condition for agreement are fruitless. They are akin to discussing sunsets and flower gardens with the color blind. I don't expect you to see until you open your eyes and embrace the same traditions that brought you the Bible. Flailing at Catholics with your white cane and damning us for our sight is simply pathetic.