Christianity has the very same "logical backing" as Islam, Hinduism, or Voodoo - zilch. A religion is not about logic, but about a spiritual state of mind.

For that reason, history, logic, or science can never contradict a religion. You can easily prove that many events from the bible never happened, but would that make your Christian belief worthless? Certainly not.

Problems only arise when people try to mix their religion with the secular world view. This produces strange results like Geocentrism or Creationism. Until the 19th century, the Roman-Catholic church and many Christians still believed that the earth was the center of the universe, despite scientists had proven this wrong centuries ago. The reason was that the church felt attacked by science - unnecessarily. For the same reason, a few Christians and Muslims still believe in Creationism today.