How do you know Christianity is real?

I was asked this question ten years ago or so by a Christian who often sounded more like an atheist. He said, "How do you know Christianity is real?" I answered, because I can see the Kingdom of Satan manifest in this world. It's easier than seeing the Kingdom of God manifest in this world.

I was reminded of this when seeing this post from an ex-pastor who was losing his faith. He posted it on one of the Q boards (QAnon).

I am an ex-pastor who has been in the process of losing my faith for months. Waking up to the reality of a ruling Satanic elite has made me reconsider faith in the God of Christianity.

Just wondering how many others on here are Christian? Do you see this as a spiritual battle? It feels like it's all right out of CS Lewis' book That Hideous Strength.

Anyway, just wanted to say that the ugly reality of darkness has convinced this wayward soul to seek the Light. [Here]

It took seeing evil manifest to convince him of the rest of the message of the Bible. Notice too that he had to wake up a bit even to see evil. Sleeping people can't even see evil, let alone the truth of the Bible.