In case you wanted an suggestion from someone that appears to be in your target audience (lapsed/non-Catholic). I’d have to say that TRUTH isn’t very appealling. Because, sorry if this offends you, I think you’re wrong. If I thought you had the fullness of the truth, I’d be Catholic too.
What appeals to me, is when I see a genuinely caring, compassionate, and friendly person talking about what they are passionate about. When I hear that, I want to see what they see, and to feel what they feel.
The reason I left church had very little to do with truth; I left because it lost it’s magic. It became redundant and boring. So if someone were to win me back, it would have to be because they had a spark to them. That they were offering more than a series of rituals and doctrine.
Besides, it’s really hard to prove you are right without saying someone else is wrong, and people hate being told they are wrong. (Did it make you upset when I told you I thought you were wrong? And I was trying to be polite as I possiblely could.)
Anyway, that’s my advice. Show your passion and your love. It will matter way more than any logical reason.