"How could you do that? I'm not a Pentecostal and have never been to a Pentecostal Church, but you really take the cake." Try it. There's a difference between someone speaking a foreign language, even one you've never heard, and someone acting like they're speaking in tongues.
You do realize that the only sin Jesus said was unforgiveable was blasphemy against the Holy Spirit.
But please, continue with your misinformed bigotry.