Actually, I was close
not by much, but I was
I just typed in 'Speaking in Tounges' in wikipedia and it gave me this;
"Glossolalia or speaking in tongues is the vocalizing of fluent speech-like syllables, often as part of religious practice. Some consider these utterances to be meaningless, others consider them to be a holy language. Its use (including use in this article) also embraces Xenoglossy - speaking in a natural language that was previously unknown to the speaker."
They also say that it is said to be a gift of the Holy Spirit, or something like that.
So, how does this relate to my guess with demons?
Demons are a part of a religious symbol (deja vu as I was typing that, btw), speaking in tounges is part of a religious practice.
Both have to do with religion
I was close : )
Hmmm...sounds like I've spoken in tounges before ;D