From http://www.lifeinthefastlane.ca/dryosaurus-dinosaur-walks-streets-of-sydney-australia/offbeat-news

This is an argument that believing in God is legitimate. It is an attack on the demand for evidence for the existence of God.

Firstly, there is a weakness in demanding a high level of proof for extraordinary events is that often only low level proof is available. There may be no one around with a camera rolling, the aliens might be shy and appear to small groups of people, the children could kill the alien before it has a chance to explain itself. :-) Or in the case of the Bible, the events that might lead to a belief happened a long, long time ago. It is unreasonable to expect extraordinary things to happen in an environment so controlled that it is near impossible to contradict them.

Secondly, although atheists claim the burden of proof is upon Christians to prove the existence of God, denying the authority of the Bible as a legitimate authority disallows most if not all positive argument for the existence of God from the Christian perspective. The most persuasive arguments occur when you take a sympathetic reading of the Bible. Such arguments include Jesus fulfils the Old Testament prophecy for a divine messiah, and that the words and actions of Jesus are believably those of a loving incarnate God. Denying the Bible denies Christians the right to prove God from their own legitimate source. An acceptable move that ought to close the discussion, but normally doesn’t.

Thirdly, claims such as ‘it is easy to prove that other people exist’ are false. It is common and normal to assume that other people exist, but that doesn’t mean they do. There is no way for me to discern whether the universe is a giant elaborate delusion in my own mind or that it actually exists as it’s presented to my senses. The people I encounter may or may not be a delusion. Unless you can exit your own mind, you will never be able to achieve a true, real, complete, objective perspective. But I argue, for the same reasons people believe other minds exist, I believe that God exists.

I may not be able to offer a proof that God exists, yet I defy anyone to prove anything else exists. Prove that anything exists and I will happily offer reasons why I think the proof is not a proof as such, but remains fundamentally uncertain.