Read the New Testament cover to cover.
NOWHERE does Jesus or the Apostles or the disciples act like
maniacs.

When at Pentecost the Apostles began speaking in tongues,
they were speaking in languages the crowd understood.
That was the sign. They didn't know these languages, but
all the crowd heard them speaking in THEIR OWN LANGUAGES!

Jesus warned us about these people.
There is something very dark in their souls, I've seen it.

Barking like a dog, or howling like a wolf, or babbling like
an idiot, rolling around on the floor, or laughing maniacally, is of the devil, Satan, Lucifer.

Avoid these people like the plague.
They will drag your soul down to hell with them, if you give
them the chance.