Re: @ g e - As an atheist...
The one I use is "where is Satan?"
At this point the truly religious will state "in Hell" and thus showing that they really don't understand the Bible at all. 3 points to blow a religious person's mind (this is based on what the Bible actually says, not how it's "interpreted"):
1. Hell is not a place any being (human, demon, devil or angelic) can "visit" and return from. It clearly states that Hell is a one way trip to non-existence, no "eternity of torture".
2. The Bible clearly says Satan chats to God in Heaven on a regular basis. In fact he's described as one of God's senior angels at one point. It also states that nothing he does is without God's consent. Read Job.
3. The casting out of Satan from Heaven is detailed in Revelations. This is a book of prophecy and therefore a description of future events. As the fall of Satan is described as a future event he must, logically, still be in Heaven and furthermore this means he's still an angel. As God cannot have sin or evil in Heaven this also means Satan is good.
The above must be true if you actually believe the Bible, it's written in the Bible and therefore must be correct. If you genuinely believe the Earth is a few thousand years old then you must also believe Satan is good, everything evil that happens is by God's will and God and Satan are best buddies who like nothing better than to sit and have long chats about how to screw up people's lives. :)