Tongues: Revisited

So, about this time last year, I was confronted with the topic of tongues once again, this time from a church my brother took me to, which declared that tongues were evidence that one was saved, and if you never spoke in tongues, then that was conclusive proof that you were not saved. Of course, I informed my brother that they were heretics and not to be listened to, BUT the discussion I had with them was nonetheless illuminating and worth discussing the topic of tongues again. So here we go;