There is at least one major problem with this line as it is typically presented.
One often hears, “there is no evidence for God, therefore Christians believe in fairytales,” (or something to that effect) when what is actually meant is more like, “there is no physical proof of God’s being in the physical world, therefore Christians believe in fairytales (since all ‘real’ things are physical).”
The fact that Christians have never claimed to believe in a physical God – as merely one more physical being among all other physical beings in the universe – does not stop these sorts of atheists from thinking they have laid waste to 40 centuries of religious thought, experience, and refinement with the mere mention of this evidentiary boogieman. It rarely occurs to them that such physical proof would actually run 100% counter to Judeo-Christian theistic claims. Their argument against a physical God is actually applauded and defended by Christians.
However, if what you mean is something more like, “There is no logical evidence of God’s existence…” then the straw man suddenly becomes a brick wall. The logical arguments for God are vast and time tested against some of the greatest minds of all time working tirelessly against them. They are well-known arguments and can be easily found online or in print, but let me give one quick example.
The fine tuning of the laws of physics...
The degree of fine-tuning is difficult to imagine. Dr. Hugh Ross gives an example of the least fine-tuned of the above four examples in his book, The Creator and the Cosmos, which is reproduced here:
Such as the fine tuned ratio of electrons and protons (1:10 to 37 power)
One part in 1037 is such an incredibly sensitive balance that it is hard to visualize. The following analogy might help: Cover the entire North American continent in dimes all the way up to the moon, a height of about 239,000 miles (In comparison, the money to pay for the U.S. federal government debt would cover one square mile less than two feet deep with dimes.). Next, pile dimes from here to the moon on a billion other continents the same size as North America. Paint one dime red and mix it into the billions of piles of dimes. Blindfold a friend and ask him to pick out one dime. The odds that he will pick the red dime are one in 1037. (p. 115)
And there are a lot more just like it, fine tuned to perfection to make the universe, and us living in it
My proof is your lack of evidence supporting your belief systemThe truth is you have no proof to back up your beliefs, so its a bit hypocritical to talk down to the faithful.