What are things a Christian can tell an atheist to make them doubt their belief?

Well to be truthful, absolutely nothing, They are intelligent people, who are temporarily insane on this one point of wisdom, but God is at work in the minds of all people, and one day when God has prepared them to accept the truth, a light will go on, and the light of God will brighten their life forever. Their biggest problem is getting past the false concept that science is always right, and religion is always wrong. I think the easiest way to get them to conceive of a brighter mind in the universe than theirs is this, Genesis 1, 3,000 years ago God sat down a common shepherd, Moses and told him how the universe was created, and he wrote it down. It still stands as the only logical explanation of the creation of the universe, but it suffers because of ignorant translators. No one questions the order of life coming into this world, They question the existence of a God and His ability to do it. They question the time reported for Him to do it in. that is where the ignorant translators come in. the Hebrew word translated as day, actually originally meant a period of time, not a set 24 hour period, so it could have been millions of years. He didn’t mention dinosaurs, but he was writing for people 3,000 years ago and there were no dinosaurs 3,000 years ago, if he had mentioned it no one would have believed him until about 200 years ago. That’s it now if you are dense enough to think a common shepherd could have sat down and come up with that on his own, you deserve to be an insane atheist. Now let me prove Noah’s flood and the tower of Babbel

I don’t know of any scientists who believe there was ever a world wide flood as described in Genesis, and yet there is historical proof that there was one, and it was world wide. I don’t know of any scientist who believes the tower of Babel was the cause of all the different languages in the world, but again, there is historical proof, which is contained in the proof of the flood, that something like the tower of Babel happened. Nothing happens in this world unless God causes it or allows it to happen.

1. If there was a world wide flood, and if Noah had 3 sons, we would expect to find, in history, 3 separate stories of this flood that would be similar, but different, that came down through the following generations, one story for each son and his children. These stories, would be major stories that were recorded long before Moses wrote Genesis, possibly by thousands of years.

Historically this is exactly what we find.

2. If the Tower of Babel story is true, The names of Noah and his children and other principle characters, would be different.

Historically this is exactly what we find.

3. If this was a true world wide event, we would find similar stories in almost every culture in the world.

Historically this is exactly what we find.

4. If the Tower of Babel story is true, none of these stories would contain the same names of any character in the Bible story.

Historically this is exactly what we find.

Conclusion: since all of the above is true, this proves the existence of God, proves the happening of a world wide flood, and proves an event that can be equated with the Tower of Babel story where all the languages of the world were changed from an original language.

Noah’s name in the 3 major stories handed down by his three sons was, Atrahasis, Utnapishtim, and Deucalion. All of these stories are known to have been recorded prior to the writing of Genesis.

In addition to these three major stories, there are over 500 other stories of a world wide flood, that have been found through out the world.

All of these stories can be found on the internet, by doing a search for “flood traditions.”

Final conclusion: there was a world wide flood, God exists, The Tower of Babel, happened.