My sister got involved in a Pentecostal church and I became fascinated by speaking in tongues. It was such obvious bullshit, and she could never explain it ("The pastor says it's the divine spirit, bla bla bla..."). So I looked it up.

In the Bible "speaking in tongues" was like a universal translator. The Christians were preaching to a multilingual crowd. There was a mighty wind (lol) and flames appeared over the preachers' heads.

From Acts: "And at this sound the multitude came together, and they were bewildered, because each one was hearing them speak in his own language."

But now because this is a fairy tale that didn't happen, it's morphed into gabbling nonsense that no-one understands.