Well, there is this:
1 Peter 3:15-16
15 but sanctify Christ as Lord in your hearts.
Always be ready to give an explanation to anyone who asks you for a reason for your hope, 16 but do it with gentleness and reverence, keeping your conscience clear, so that, when you are maligned, those who defame your good conduct in Christ may themselves be put to shame.
Any chance you get to talk to a non-Catholic about your faith is an opportunity do obey the commandments of the Lord and “spread the Gospel to all nations.”
But in reference to verse 16 above, it does no goods to tell a person the things that are wrong with their beliefs. Simply tell them what is right about your opposing beliefs.
“No, I don’t think there is anything wrong with Protestantism, but I feel like it’s missing so much of what Christ taught us.”
And when they say “Like what?” they’ve opened the gates for the sacraments, the true body, blood and divinity of Christ in the Eucharist, reconciliation, infant baptism, holy orders, etc. And they will have objections to all of that and they will recite scripture to prove it, but you have the power of 2000 years of unchanging Church teaching and the logical, very scriptural basis for it.
Two things. Never shy away from the opportunity to discuss our faith but also, never get drawn into an argument about it. Use every interaction as a teaching opportunity and show them the logical, scriptural basis of Catholic teaching. Remember, if it were not for the Catholic Church, they would not even have the bible to quote to you.
Here’s
a good reference web site that lists hundreds of scripture verses to support specific Catholic teachings. I’ve found it extremely useful when someone asks “Oh yea? Where is THAT in the bible?”
God bless.