I can't take Pentecostal speaking in tongues seriously. If I need to talk to God without satan knowing I'll just speak to God through my mind, something Satan can't read.
It's all just blabbering. I mean, for all I know, the speaking in tongues of the Pentecostal church might be real but as far as I can see, the Bible isn't explicit on what speaking in tongues is actually like. I think that if the Holy Spirit really blessed me with an ability, I would feel it like an instinct.
I've never felt such an ability.