You're right...it's a matter two things, both necessary.

- Catholics must know the teaching SO WELL, deeply (fully..not simply their opinion of it), 
- Catholics must know what real friendship is, being able to develop unhurried friendships with people. Sincere. Not bent on "conversion" but instead sincere friendship.  And over time, as friendships develop...topics move from the superficial..weather, food, events, feelings...to the substantial....truth, beauty, the good...to the supernatural...God, our purpose, our end, sin, real love. 

We have tocome far better friends to our friends...we need to take real ordinary ownership of our faith, and the true good of our friends.