Actually, not just "know our Faith", but know apologetics -- the defense of the Faith. Know something about how the various false religions got started, what is wrong with them, how to refute them, etc.

There is a lot of error out there, and a lot of it is convincing. A lot of it is in video form, and people always assume videos speak the truth and only the gospel truth. I don't know why, but video has taken over this role from print media.

People get excited when they are on the evening news, as if they have just become "real people" now.

Anyhow, I saw in an interesting video on Youtube (one of those easy to digest, interesting, bite-sized distractions), entitled, "What if the Reformation hadn't happened?" just mentioned that Luther was the first to translate the Bible into German. He was basically uttering a common myth, and fortunately I remember from my seminary/study days that it was a myth. So I looked it up, and sure enough my memory served me rightly:

Luther took it upon himself to add his own German translation to sacred scripture. The myth is that he was the first to do so, and his actions allowed the bible to be read by the common man, instead of only the learned who understood Latin. But St. Jerome, in the 4th Century, beat him to the punch by 1100 years!  Previously, the bible was only available in Hebrew and Greek:  St. Jerome translated all of the 73 books of sacred scripture into the common European vernacular of the day, Latin.  This allowed just about everyone who could read, to read the bible, and the bible was read at every Mass everywhere a Mass was said! St. Cyril and St. Methodius also translated the bible into the Slavonic language in the year 863.  A previous German bible, the Koberger bible, was PRINTED in 1483, and was commonly available.  The first book ever printed, the Gutenberg Bible, printed in the century before Luther, assured the availability of the Bible to all who could understand Latin, and at a much reduced cost than the hand-transcribed bibles of Catholic Monks.

Moral of the story: think of how many young men who HAVEN'T read apologetics books, HAVEN'T spent time in a seminary, who would watch the video mentioned above, hear a lie like "Luther finally made the Bible available to the masses", and  try to make sense of it.

They would assume it was true, and try to justify it on that basis.

When the true way to deal with it is: It's a lie! Forget it!

Watch out for Dove.    I was looking for the movie Joyeux noel the movie about the Christmas Truce of World War I.  There was a dove movie of the similiar name title  and the movie attacked and mocked the Catholic Church.  

Anyone who has the chance to go to a catechism class regularly should do so.  Having available such a resource is not to be taken lightly.  There are places in the world today where any Catholic class like that is illegal and holding one would only ensure getting arrested or worse.  The one true Faith is under attack, and it's our duty to preserve it if we can.