I discovered this criteria on the internet on July 28, 2007. 

1. Summary of what would have a good chance of convincing a future Christian:
   1. Verified, clear, specific prophecies that could not have been contrived.  Long term prophecies can be veiled, since otherwise they would have been corrupted.  They must be verified by at least two or three witnesses.
   2. Miraculous occurrences, especially if brought about through prayer.  Best if verified or from an unimpeachable source.
   3. Any direct, verifiable manifestation of the divine by voice or visions.  Best if verified by several sources.
   4. Aliens who believe in exactly the same religion.  (Demons are real aliens.)
2. Summary of what a future Christian would like to see, assuming direct intervention by a god:
   1. a religion without internal disputes or factions.
   2. Knowledge in that religion's writings that was not available at that time.
   3. a genuinely flawless and consistent holy book.
   4. a religion whose followers have not committed or taken part in any atrocities.
3. Summary of what would be dismissed by a future Christian:
   1. "miracles" that are human origin, natural or coincidental.
   2. people's conversion stories without a good explanation of why they did it.
   3. the Bible code or other numerological feats.
   4. any explanation of creationism or young earth.
4. Summary of things a future Christian often overlooks:
   1. God has an interface for dealing with humans called "promises."  Since He is justice personified, He must be approached through these.
   2. There are aliens called demons promoting evil, dishonesty and alienation from God.  They have been around for thousands of years. They have mastered how to mislead people and recruit allies.  Some of these allies are even in churches and seminaries, causing mayhem.
   3. Good and evil can coexist because of god's "mercy."  This is only postponed justice for all, since we all are under the same sentence.  Inevitably, justice will come to pass to the last speck.  Fortunately, God himself came up with a loophole in his own law to save us from the judgment -- a Messiah.
   4. Current science is disprovable at any time.  The methodology covers a small minority of occurrences.  Beyond those, the religious writings may be more accurate.  There is a lot of opinion and dishonest research that is being called "science"  that has no foundation in real science.
   5.  The Atheist says, "We are open minded."
      Answer: We have been inculcated with the elements of atheism in government schools, with the assumption that each individual will have a contrived Epiphany when they connect the dots given them in school. Because of the Epiphany effect, they will claim it as their own, making it very difficult to show them another world view.