I genuinely don't know how to engage with Protestants online
There was a Facebook reel I commented on a few days ago posted by a non-denominational Christian claiming that every denomination has errors that steer away from genuine Christianity as expressed in the Bible. This was a response to a young Catholic college student. I stated that Catholicism is pre-denominational, that Christ did not want denominations but one Church and that the non-denominational form of Christianity is essentially just watered down Protestantism.
Well, I got one reply today from a guy close to my age. He claimed Catholicism is a cult. I asked him why. He then gave me a handful of mischaracterizations of the Catholic faith I've heard a thousand times before that by any academic understanding of a cult simply misses the mark. I knew from past experiences that a comment chain on a post or reel will never convince any Protestant that Apostolic Christianity is true, so I encouraged him to DM me. Even if there was still genuine disagreement and moral reservations from his part, I hoped the discussion would at least help him understand the Catholic position better.
Instead, he accused me of knowing the truth as expressed in the Bible, but still willingly wanted to remain in idolatry (worshiping Mary, angels, priests) to justify sin. To be clear, we do justify our sins all the time, or at least I do before I accept humility to repent. But why would I genuinely know what Christ taught yet worship Mary as if she was a god? What do I have to gain from that?
I haven't replied to him yet and I don't know if I should. It's just simply bizarre to me. I even offered an olive branch and wished him a blessed day if he declines to DM me, but then he hit me with that response. Is there more that I should have done or still can do? It discourages me that so many otherwise good Christians are so hostile to Catholicism simply because they were taught this by someone else who has no idea what the Catholic Church actually teaches. It's all the more frustrating as these questions have been answered so many times by Catholics who know Scripture like the back of their hand. This is not esoteric knowledge. Just Google it or go on Catholic Answers or something.