This is crux of a Biblical debate, most people protestant, catholic, non-denomination, ect don’t know the Bible.
Or if more then likely if they do know the Bible, they know just enough to justify their position but not enough to prove other positions incorrect.
But the another big problem, is that is a sola scriptura Christian were to debate a catholic, the playing field isn’t the same. Catholic put alot of “faith” in the teaching of the fathers of the catholic church, previous saint and popes, and the catechism. Its hard to debate from a BIblical POV if the person you are debating references something you something to prove his point that your don’t believe is inspired in the first place.
I have had many debates with various people of various religions about specific things and they always go back to a church tradition or a church law book.
Really for a protestant to “beat” a catholic in a debate, that protestant has to be a master of catholic tradition and teaching to show inconsistencies and inaccuracies. And really the only people that might be able to do that are Priests that convert to other denominations, which does happen by the way.
But the big thing I suggest, is don’t get mad or upset with the person you are debating, they aren’t out to get you, but more then likely just trying to learn your point of view.
You also can’t approach it as a conversion chance, just as a friendly discussion.