Are tongues a sign of the Holy Spirit?

[YYZ Skinhead]

I went to a Pentecostal church on the invitation of some very kind, obviously God-fearing people and I've had them come to my door and pray for me, but when they spoke in tongues it sounded A LOT like they were speaking Hindu. I got so scared I ran out of the church and almost into a crowded Los Angeles street at night. These poor people can't possibly know that speaking in tongues is occultic and can open demonic doorways into their lives.